Decimal Decimal Decimal Decimal Constructors

Definizione

Overload

Decimal(Double) Decimal(Double) Decimal(Double) Decimal(Double)

Inizializza una nuova istanza di Decimal sul valore del numero a virgola mobile a precisione doppia specificato.Initializes a new instance of Decimal to the value of the specified double-precision floating-point number.

Decimal(Int32) Decimal(Int32) Decimal(Int32) Decimal(Int32)

Inizializza una nuova istanza di Decimal sul valore dell'intero con segno a 32 bit specificato.Initializes a new instance of Decimal to the value of the specified 32-bit signed integer.

Decimal(Int32[]) Decimal(Int32[]) Decimal(Int32[]) Decimal(Int32[])

Inizializza una nuova istanza di Decimal su un valore decimale rappresentato in formato binario e contenuto nella matrice specificata.Initializes a new instance of Decimal to a decimal value represented in binary and contained in a specified array.

Decimal(Int64) Decimal(Int64) Decimal(Int64) Decimal(Int64)

Inizializza una nuova istanza di Decimal sul valore dell'intero con segno a 64 bit specificato.Initializes a new instance of Decimal to the value of the specified 64-bit signed integer.

Decimal(Single) Decimal(Single) Decimal(Single) Decimal(Single)

Inizializza una nuova istanza di Decimal sul valore del numero a virgola mobile a precisione singola specificato.Initializes a new instance of Decimal to the value of the specified single-precision floating-point number.

Decimal(UInt32) Decimal(UInt32) Decimal(UInt32) Decimal(UInt32)

Inizializza una nuova istanza di Decimal sul valore dell'intero senza segno a 32 bit specificato.Initializes a new instance of Decimal to the value of the specified 32-bit unsigned integer.

Decimal(UInt64) Decimal(UInt64) Decimal(UInt64) Decimal(UInt64)

Inizializza una nuova istanza di Decimal sul valore dell'intero senza segno a 64 bit specificato.Initializes a new instance of Decimal to the value of the specified 64-bit unsigned integer.

Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte)

Inizializza una nuova istanza di Decimal dai parametri che specificano le parti costitutive dell'istanza.Initializes a new instance of Decimal from parameters specifying the instance's constituent parts.

Decimal(Double) Decimal(Double) Decimal(Double) Decimal(Double)

Inizializza una nuova istanza di Decimal sul valore del numero a virgola mobile a precisione doppia specificato.Initializes a new instance of Decimal to the value of the specified double-precision floating-point number.

public:
 Decimal(double value);
public Decimal (double value);
new decimal : double -> decimal
Public Sub New (value As Double)

Parametri

value
Double Double Double Double

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Eccezioni

value è maggiore di MaxValue o minore di MinValue.value is greater than MaxValue or less than MinValue.

In alternativa-or- value è NaN, PositiveInfinity o NegativeInfinity.value is NaN, PositiveInfinity, or NegativeInfinity.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una Double struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with a Double value.

// Example of the Decimal( double ) constructor.
using namespace System;

// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}


// Create a Decimal object and display its value.
void CreateDecimal( double value, String^ valToStr )
{
   
   // Format and display the constructor.
   Console::Write( "{0,-34}", String::Format( "Decimal( {0} )", valToStr ) );
   try
   {
      
      // Construct the Decimal value.
      Decimal decimalNum = Decimal(value);
      
      // Display the value if it was created successfully.
      Console::WriteLine( "{0,31}", decimalNum );
   }
   catch ( Exception^ ex ) 
   {
      
      // Display the exception type if an exception was thrown.
      Console::WriteLine( "{0,31}", GetExceptionType( ex ) );
   }

}

int main()
{
   Console::WriteLine( "This example of the Decimal( double ) "
   "constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-34}{1,31}", "Constructor", "Value or Exception" );
   Console::WriteLine( "{0,-34}{1,31}", "-----------", "------------------" );
   
   // Construct Decimal objects from double values.
   CreateDecimal( 1.23456789E+5, "1.23456789E+5" );
   CreateDecimal( 1.234567890123E+15, "1.234567890123E+15" );
   CreateDecimal( 1.2345678901234567E+25, "1.2345678901234567E+25" );
   CreateDecimal( 1.2345678901234567E+35, "1.2345678901234567E+35" );
   CreateDecimal( 1.23456789E-5, "1.23456789E-5" );
   CreateDecimal( 1.234567890123E-15, "1.234567890123E-15" );
   CreateDecimal( 1.2345678901234567E-25, "1.2345678901234567E-25" );
   CreateDecimal( 1.2345678901234567E-35, "1.2345678901234567E-35" );
   CreateDecimal( 1.0 / 7.0, "1.0 / 7.0" );
}

/*
This example of the Decimal( double ) constructor
generates the following output.

Constructor                                    Value or Exception
-----------                                    ------------------
Decimal( 1.23456789E+5 )                               123456.789
Decimal( 1.234567890123E+15 )                    1234567890123000
Decimal( 1.2345678901234567E+25 )      12345678901234600000000000
Decimal( 1.2345678901234567E+35 )               OverflowException
Decimal( 1.23456789E-5 )                          0.0000123456789
Decimal( 1.234567890123E-15 )       0.000000000000001234567890123
Decimal( 1.2345678901234567E-25 )  0.0000000000000000000000001235
Decimal( 1.2345678901234567E-35 )                               0
Decimal( 1.0 / 7.0 )                            0.142857142857143
*/
// Example of the decimal( double ) constructor.
using System;

class DecimalCtorDoDemo
{
    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' )+1 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( double value, string valToStr )
    {
        // Format and display the constructor.
        Console.Write( "{0,-34}", 
            String.Format( "decimal( {0} )", valToStr ) );

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( value );

            // Display the value if it was created successfully.
            Console.WriteLine( "{0,31}", decimalNum );
        }
        catch( Exception ex )
        {
            // Display the exception type if an exception was thrown.
            Console.WriteLine( "{0,31}", GetExceptionType( ex ) );
        }
    }
    
    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal( double ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-34}{1,31}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-34}{1,31}", "-----------", 
            "------------------" );

        // Construct decimal objects from double values.
        CreateDecimal( 1.23456789E+5, "1.23456789E+5" );
        CreateDecimal( 1.234567890123E+15, "1.234567890123E+15" );
        CreateDecimal( 1.2345678901234567E+25, 
            "1.2345678901234567E+25" );
        CreateDecimal( 1.2345678901234567E+35, 
            "1.2345678901234567E+35" );
        CreateDecimal( 1.23456789E-5, "1.23456789E-5" );
        CreateDecimal( 1.234567890123E-15, "1.234567890123E-15" );
        CreateDecimal( 1.2345678901234567E-25, 
            "1.2345678901234567E-25" );
        CreateDecimal( 1.2345678901234567E-35, 
            "1.2345678901234567E-35" );
        CreateDecimal( 1.0 / 7.0, "1.0 / 7.0" );
    }
}

/*
This example of the decimal( double ) constructor
generates the following output.

Constructor                                    Value or Exception
-----------                                    ------------------
decimal( 1.23456789E+5 )                               123456.789
decimal( 1.234567890123E+15 )                    1234567890123000
decimal( 1.2345678901234567E+25 )      12345678901234600000000000
decimal( 1.2345678901234567E+35 )               OverflowException
decimal( 1.23456789E-5 )                          0.0000123456789
decimal( 1.234567890123E-15 )       0.000000000000001234567890123
decimal( 1.2345678901234567E-25 )  0.0000000000000000000000001235
decimal( 1.2345678901234567E-35 )                               0
decimal( 1.0 / 7.0 )                            0.142857142857143
*/
' Example of the Decimal( Double ) constructor.
Module DecimalCtorDoDemo

    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As Double, valToStr As String )

        ' Format and display the constructor.
        Console.Write( "{0,-34}", _
            String.Format( "Decimal( {0} )", valToStr ) )

        ' Construct the Decimal value.
        Try
            Dim decimalNum As New Decimal( value )

            ' Display the value if it was created successfully.
            Console.WriteLine( "{0,31}", decimalNum )

        ' Display the exception type if an exception was thrown.
        Catch ex As Exception
            Console.WriteLine( "{0,31}", GetExceptionType( ex ) )
        End Try
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( Double ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-34}{1,31}", "Constructor", _
            "Value or Exception" )
        Console.WriteLine( "{0,-34}{1,31}", "-----------", _
            "------------------" )

        ' Construct Decimal objects from Double values.
        CreateDecimal( 1.23456789E+5, "1.23456789E+5" )                
        CreateDecimal( 1.234567890123E+15, "1.234567890123E+15" )                
        CreateDecimal( 1.2345678901234567E+25, _
            "1.2345678901234567E+25" )
        CreateDecimal( 1.2345678901234567E+35, _
            "1.2345678901234567E+35" )
        CreateDecimal( 1.23456789E-5, "1.23456789E-5" )                
        CreateDecimal( 1.234567890123E-15, "1.234567890123E-15" )      
        CreateDecimal( 1.2345678901234567E-25, _
            "1.2345678901234567E-25" ) 
        CreateDecimal( 1.2345678901234567E-35, _
            "1.2345678901234567E-35" ) 
        CreateDecimal( 1.0 / 7.0, "1.0 / 7.0" ) 
    End Sub 
End Module 

' This example of the Decimal( Double ) constructor
' generates the following output.
' 
' Constructor                                    Value or Exception
' -----------                                    ------------------
' Decimal( 1.23456789E+5 )                               123456.789
' Decimal( 1.234567890123E+15 )                    1234567890123000
' Decimal( 1.2345678901234567E+25 )      12345678901234600000000000
' Decimal( 1.2345678901234567E+35 )               OverflowException
' Decimal( 1.23456789E-5 )                          0.0000123456789
' Decimal( 1.234567890123E-15 )       0.000000000000001234567890123
' Decimal( 1.2345678901234567E-25 )  0.0000000000000000000000001235
' Decimal( 1.2345678901234567E-35 )                               0
' Decimal( 1.0 / 7.0 )                            0.142857142857143

Commenti

Questo costruttore arrotonda value a 15 cifre significative usando l'arrotondamento al più vicino.This constructor rounds value to 15 significant digits using rounding to nearest. Questa operazione viene eseguita anche se il numero ha più di 15 cifre e le cifre meno significative sono pari a zero.This is done even if the number has more than 15 digits and the less significant digits are zero.

Decimal(Int32) Decimal(Int32) Decimal(Int32) Decimal(Int32)

Inizializza una nuova istanza di Decimal sul valore dell'intero con segno a 32 bit specificato.Initializes a new instance of Decimal to the value of the specified 32-bit signed integer.

public:
 Decimal(int value);
public Decimal (int value);
new decimal : int -> decimal
Public Sub New (value As Integer)

Parametri

value
Int32 Int32 Int32 Int32

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una Int32 struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with an Int32 value.

// Example of the Decimal( int ) constructor.
using namespace System;

// Create a Decimal object and display its value.
void CreateDecimal( int value, String^ valToStr )
{
   Decimal decimalNum = Decimal(value);
   
   // Format the constructor for display.
   String^ ctor = String::Format( "Decimal( {0} )", valToStr );
   
   // Display the constructor and its value.
   Console::WriteLine( "{0,-30}{1,16}", ctor, decimalNum );
}

int main()
{
   Console::WriteLine( "This example of the Decimal( int ) "
   "constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-30}{1,16}", "Constructor", "Value" );
   Console::WriteLine( "{0,-30}{1,16}", "-----------", "-----" );
   
   // Construct Decimal objects from int values.
   CreateDecimal( Int32::MinValue, "Int32::MinValue" );
   CreateDecimal( Int32::MaxValue, "Int32::MaxValue" );
   CreateDecimal( 0, "0" );
   CreateDecimal( 999999999, "999999999" );
   CreateDecimal( 0x40000000, "0x40000000" );
   CreateDecimal( (int)0xC0000000, "(int)0xC0000000" );
}

/*
This example of the Decimal( int ) constructor
generates the following output.

Constructor                              Value
-----------                              -----
Decimal( Int32::MinValue )         -2147483648
Decimal( Int32::MaxValue )          2147483647
Decimal( 0 )                                 0
Decimal( 999999999 )                 999999999
Decimal( 0x40000000 )               1073741824
Decimal( (int)0xC0000000 )         -1073741824
*/
// Example of the decimal( int ) constructor.
using System;

class DecimalCtorIDemo
{
    // Create a decimal object and display its value.
    public static void CreateDecimal( int value, string valToStr )
    {
        decimal decimalNum = new decimal( value );

        // Format the constructor for display.
        string ctor = String.Format( "decimal( {0} )", valToStr );

        // Display the constructor and its value.
        Console.WriteLine( "{0,-30}{1,16}", ctor, decimalNum );
    }
    
    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal( int ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-30}{1,16}", "Constructor", "Value" );
        Console.WriteLine( "{0,-30}{1,16}", "-----------", "-----" );

        // Construct decimal objects from int values.
        CreateDecimal( int.MinValue, "int.MinValue" );
        CreateDecimal( int.MaxValue, "int.MaxValue" );
        CreateDecimal( 0, "0" );
        CreateDecimal( 999999999, "999999999" );
        CreateDecimal( 0x40000000, "0x40000000" );
        CreateDecimal( unchecked( (int)0xC0000000 ), 
            "(int)0xC0000000" );
    }
}

/*
This example of the decimal( int ) constructor
generates the following output.

Constructor                              Value
-----------                              -----
decimal( int.MinValue )            -2147483648
decimal( int.MaxValue )             2147483647
decimal( 0 )                                 0
decimal( 999999999 )                 999999999
decimal( 0x40000000 )               1073741824
decimal( (int)0xC0000000 )         -1073741824
*/
' Example of the Decimal( Integer ) constructor.
Module DecimalCtorIDemo

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As Integer, valToStr As String )

        Dim decimalNum As New Decimal( value )

        ' Format the constructor for display.
        Dim ctor As String = _
            String.Format( "Decimal( {0} )", valToStr )

        ' Display the constructor and its value.
        Console.WriteLine( "{0,-33}{1,16}", ctor, decimalNum )
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( Integer ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-33}{1,16}", "Constructor", "Value" )
        Console.WriteLine( "{0,-33}{1,16}", "-----------", "-----" )

        ' Construct Decimal objects from Integer values.
        CreateDecimal( Integer.MinValue, "Integer.MinValue" )                
        CreateDecimal( Integer.MaxValue, "Integer.MaxValue" )                
        CreateDecimal( 0, "0" )                
        CreateDecimal( 999999999, "999999999" )                
        CreateDecimal( &H40000000, "&H40000000" )                
        CreateDecimal( &HC0000000, "&HC0000000" )                
    End Sub 
End Module 

' This example of the Decimal( Integer ) constructor
' generates the following output.
' 
' Constructor                                 Value
' -----------                                 -----
' Decimal( Integer.MinValue )           -2147483648
' Decimal( Integer.MaxValue )            2147483647
' Decimal( 0 )                                    0
' Decimal( 999999999 )                    999999999
' Decimal( &H40000000 )                  1073741824
' Decimal( &HC0000000 )                 -1073741824

Decimal(Int32[]) Decimal(Int32[]) Decimal(Int32[]) Decimal(Int32[])

Inizializza una nuova istanza di Decimal su un valore decimale rappresentato in formato binario e contenuto nella matrice specificata.Initializes a new instance of Decimal to a decimal value represented in binary and contained in a specified array.

public:
 Decimal(cli::array <int> ^ bits);
public Decimal (int[] bits);
new decimal : int[] -> decimal
Public Sub New (bits As Integer())

Parametri

bits
Int32[]

Matrice di interi con segno a 32 bit che contiene una rappresentazione di un valore decimale.An array of 32-bit signed integers containing a representation of a decimal value.

Eccezioni

La lunghezza di bits non è 4.The length of the bits is not 4.

-oppure--or- La rappresentazione del valore decimale in bits non è valida.The representation of the decimal value in bits is not valid.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una struttura con una Int32 matrice di quattro valori.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with an array of four Int32 values.

// Example of the Decimal( int __gc [ ] ) constructor.
using namespace System;

// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}


// Create a Decimal object and display its value.
void CreateDecimal( array<int>^bits )
{
   
   // Format the constructor for display.
   String^ ctor = String::Format( "Decimal( {{ 0x{0:X}", bits[ 0 ] );
   String^ valOrExc;
   for ( int index = 1; index < bits->Length; index++ )
      ctor = String::Concat( ctor, String::Format( ", 0x{0:X}", bits[ index ] ) );
   ctor = String::Concat( ctor, " } )" );
   try
   {
      
      // Construct the Decimal value.
      Decimal decimalNum = Decimal(bits);
      
      // Format the Decimal value for display.
      valOrExc = decimalNum.ToString();
   }
   catch ( Exception^ ex ) 
   {
      
      // Save the exception type if an exception was thrown.
      valOrExc = GetExceptionType( ex );
   }

   
   // Display the constructor and Decimal value or exception.
   int ctorLen = 76 - valOrExc->Length;
   
   // Display the data on one line if it will fit.
   if ( ctorLen > ctor->Length )
      Console::WriteLine( "{0}{1}", ctor->PadRight( ctorLen ), valOrExc );
   // Otherwise, display the data on two lines.
   else
   {
      Console::WriteLine( "{0}", ctor );
      Console::WriteLine( "{0,76}", valOrExc );
   }
}

int main()
{
   Console::WriteLine( "This example of the Decimal( int __gc [ ] ) "
   "constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-38}{1,38}", "Constructor", "Value or Exception" );
   Console::WriteLine( "{0,-38}{1,38}", "-----------", "------------------" );
   
   // Construct Decimal objects from integer arrays.
   array<Int32>^zero = {0,0,0,0};
   CreateDecimal( zero );
   array<Int32>^arrayShort = {0,0,0};
   CreateDecimal( arrayShort );
   array<Int32>^arrayLong = {0,0,0,0,0};
   CreateDecimal( arrayLong );
   array<Int32>^word0Data = {1000000000,0,0,0};
   CreateDecimal( word0Data );
   array<Int32>^word1Data = {0,1000000000,0,0};
   CreateDecimal( word1Data );
   array<Int32>^word2Data = {0,0,1000000000,0};
   CreateDecimal( word2Data );
   array<Int32>^word3Data = {0,0,0,1000000000};
   CreateDecimal( word3Data );
   array<Int32>^decMax = { -1,-1,-1,0};
   CreateDecimal( decMax );
   array<Int32>^decMin = { -1,-1,-1,0x80000000};
   CreateDecimal( decMin );
   array<Int32>^fracDig16 = { -1,0,0,0x100000};
   CreateDecimal( fracDig16 );
   array<Int32>^fracDig28 = { -1,0,0,0x1C0000};
   CreateDecimal( fracDig28 );
   array<Int32>^fracDig29 = { -1,0,0,0x1D0000};
   CreateDecimal( fracDig29 );
   array<Int32>^reserved = { -1,0,0,0x1C0001};
   CreateDecimal( reserved );
   array<Int32>^Same4Words = {0xF0000,0xF0000,0xF0000,0xF0000};
   CreateDecimal( Same4Words );
}

/*
This example of the Decimal( int __gc [ ] ) constructor
generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
Decimal( { 0x0, 0x0, 0x0, 0x0 } )                                          0
Decimal( { 0x0, 0x0, 0x0 } )                               ArgumentException
Decimal( { 0x0, 0x0, 0x0, 0x0, 0x0 } )                     ArgumentException
Decimal( { 0x3B9ACA00, 0x0, 0x0, 0x0 } )                          1000000000
Decimal( { 0x0, 0x3B9ACA00, 0x0, 0x0 } )                 4294967296000000000
Decimal( { 0x0, 0x0, 0x3B9ACA00, 0x0 } )       18446744073709551616000000000
Decimal( { 0x0, 0x0, 0x0, 0x3B9ACA00 } )                   ArgumentException
Decimal( { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x0 } )
                                               79228162514264337593543950335
Decimal( { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x80000000 } )
                                              -79228162514264337593543950335
Decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x100000 } )             0.0000004294967295
Decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1C0000 } ) 0.0000000000000000004294967295
Decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1D0000 } )              ArgumentException
Decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1C0001 } )              ArgumentException
Decimal( { 0xF0000, 0xF0000, 0xF0000, 0xF0000 } )
                                                 18133887298.441562272235520
*/
// Example of the decimal( int[ ] ) constructor.
using System;

class DecimalCtorIArrDemo
{
    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( int[ ] bits )
    {
        // Format the constructor for display.
        string ctor = String.Format( 
            "decimal( {{ 0x{0:X}", bits[ 0 ] );
        string valOrExc;
        
        for( int index = 1; index < bits.Length; index++ )
            ctor += String.Format( ", 0x{0:X}", bits[ index ] );
        ctor += " } )";

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( bits );

            // Format the decimal value for display.
            valOrExc = decimalNum.ToString( );
        }
        catch( Exception ex )
        {
            // Save the exception type if an exception was thrown.
            valOrExc = GetExceptionType( ex );
        }

        // Display the constructor and decimal value or exception.
        int ctorLen = 76 - valOrExc.Length;

        // Display the data on one line if it will fit.
        if( ctorLen > ctor.Length )
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), 
                valOrExc );

        // Otherwise, display the data on two lines.
        else
        {
            Console.WriteLine( "{0}", ctor );
            Console.WriteLine( "{0,76}", valOrExc );
        }
    }
    
    public static void Main( )
    {
        Console.WriteLine( 
            "This example of the decimal( int[ ] ) constructor " +
            "\ngenerates the following output.\n" );
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-38}{1,38}", "-----------", 
            "------------------" );

        // Construct decimal objects from integer arrays.
        CreateDecimal( new int[ ] { 0, 0, 0, 0 } );
        CreateDecimal( new int[ ] { 0, 0, 0 } );
        CreateDecimal( new int[ ] { 0, 0, 0, 0, 0 } );
        CreateDecimal( new int[ ] { 1000000000, 0, 0, 0 } );
        CreateDecimal( new int[ ] { 0, 1000000000, 0, 0 } );
        CreateDecimal( new int[ ] { 0, 0, 1000000000, 0 } );
        CreateDecimal( new int[ ] { 0, 0, 0, 1000000000 } );
        CreateDecimal( new int[ ] { -1, -1, -1, 0 } );
        CreateDecimal( new int[ ] 
            { -1, -1, -1, unchecked( (int)0x80000000 ) } );
        CreateDecimal( new int[ ] { -1, 0, 0, 0x100000 } );
        CreateDecimal( new int[ ] { -1, 0, 0, 0x1C0000 } );
        CreateDecimal( new int[ ] { -1, 0, 0, 0x1D0000 } );
        CreateDecimal( new int[ ] { -1, 0, 0, 0x1C0001 } );
        CreateDecimal( new int[ ] 
            { 0xF0000, 0xF0000, 0xF0000, 0xF0000 } );
    }
}

/*
This example of the decimal( int[ ] ) constructor
generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
decimal( { 0x0, 0x0, 0x0, 0x0 } )                                          0
decimal( { 0x0, 0x0, 0x0 } )                               ArgumentException
decimal( { 0x0, 0x0, 0x0, 0x0, 0x0 } )                     ArgumentException
decimal( { 0x3B9ACA00, 0x0, 0x0, 0x0 } )                          1000000000
decimal( { 0x0, 0x3B9ACA00, 0x0, 0x0 } )                 4294967296000000000
decimal( { 0x0, 0x0, 0x3B9ACA00, 0x0 } )       18446744073709551616000000000
decimal( { 0x0, 0x0, 0x0, 0x3B9ACA00 } )                   ArgumentException
decimal( { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x0 } )
                                               79228162514264337593543950335
decimal( { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x80000000 } )
                                              -79228162514264337593543950335
decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x100000 } )             0.0000004294967295
decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1C0000 } ) 0.0000000000000000004294967295
decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1D0000 } )              ArgumentException
decimal( { 0xFFFFFFFF, 0x0, 0x0, 0x1C0001 } )              ArgumentException
decimal( { 0xF0000, 0xF0000, 0xF0000, 0xF0000 } )
                                                 18133887298.441562272235520
*/
' Example of the Decimal( Integer( ) ) constructor.
Module DecimalCtorIArrDemo

    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( ByVal bits( ) As Integer )

        ' Format and save the constructor.
        Dim ctor As String = String.Format( "Decimal( {{ &H{0:X}", bits( 0 ) )
        Dim valOrExc As String
        Dim index As Integer
        For index = 1 to bits.Length - 1
            ctor &= String.Format( ", &H{0:X}", bits( index ) )
        Next index
        ctor &= " } )"

        ' Construct the Decimal value.
        Try
            Dim decimalNum As New Decimal( bits )

            ' Format the Decimal value for display.
            valOrExc = decimalNum.ToString( )

        ' Save the exception type if an exception was thrown.
        Catch ex As Exception
            valOrExc =  GetExceptionType( ex ) 
        End Try

        ' Display the constructor and Decimal value or exception.
        Dim ctorLen As Integer = 76 - valOrExc.Length
        If ctorLen > ctor.Length Then

            ' Display the data on one line if it will fit.
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), _
                valOrExc )

        ' Otherwise, display the data on two lines.
        Else
            Console.WriteLine( "{0}", ctor )
            Console.WriteLine( "{0,76}", valOrExc )
        End If
    End Sub
    
    Sub Main( )

        Console.WriteLine( "This example of the " & _
            "Decimal( Integer( ) ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", _
            "Value or Exception" )
        Console.WriteLine( "{0,-38}{1,38}", "-----------", _
            "------------------" )

        ' Construct Decimal objects from Integer arrays.
        CreateDecimal( New Integer( ) { 0, 0, 0, 0 } )
        CreateDecimal( New Integer( ) { 0, 0, 0 } )
        CreateDecimal( New Integer( ) { 0, 0, 0, 0, 0 } )
        CreateDecimal( New Integer( ) { 1000000000, 0, 0, 0 } )
        CreateDecimal( New Integer( ) { 0, 1000000000, 0, 0 } )
        CreateDecimal( New Integer( ) { 0, 0, 1000000000, 0 } )
        CreateDecimal( New Integer( ) { 0, 0, 0, 1000000000 } )
        CreateDecimal( New Integer( ) { -1, -1, -1, 0 } )
        CreateDecimal( New Integer( ) { -1, -1, -1, &H80000000 } )
        CreateDecimal( New Integer( ) { -1, 0, 0, &H100000 } )
        CreateDecimal( New Integer( ) { -1, 0, 0, &H1C0000 } )
        CreateDecimal( New Integer( ) { -1, 0, 0, &H1D0000 } )
        CreateDecimal( New Integer( ) { -1, 0, 0, &H1C0001 } )
        CreateDecimal( New Integer( ) _
            { &HF0000, &HF0000, &HF0000, &HF0000 } )
    End Sub 
End Module 

' This example of the Decimal( Integer( ) ) constructor
' generates the following output.
' 
' Constructor                                               Value or Exception
' -----------                                               ------------------
' Decimal( { &H0, &H0, &H0, &H0 } )                                          0
' Decimal( { &H0, &H0, &H0 } )                               ArgumentException
' Decimal( { &H0, &H0, &H0, &H0, &H0 } )                     ArgumentException
' Decimal( { &H3B9ACA00, &H0, &H0, &H0 } )                          1000000000
' Decimal( { &H0, &H3B9ACA00, &H0, &H0 } )                 4294967296000000000
' Decimal( { &H0, &H0, &H3B9ACA00, &H0 } )       18446744073709551616000000000
' Decimal( { &H0, &H0, &H0, &H3B9ACA00 } )                   ArgumentException
' Decimal( { &HFFFFFFFF, &HFFFFFFFF, &HFFFFFFFF, &H0 } )
'                                                79228162514264337593543950335
' Decimal( { &HFFFFFFFF, &HFFFFFFFF, &HFFFFFFFF, &H80000000 } )
'                                               -79228162514264337593543950335
' Decimal( { &HFFFFFFFF, &H0, &H0, &H100000 } )             0.0000004294967295
' Decimal( { &HFFFFFFFF, &H0, &H0, &H1C0000 } ) 0.0000000000000000004294967295
' Decimal( { &HFFFFFFFF, &H0, &H0, &H1D0000 } )              ArgumentException
' Decimal( { &HFFFFFFFF, &H0, &H0, &H1C0001 } )              ArgumentException
' Decimal( { &HF0000, &HF0000, &HF0000, &HF0000 } )
'                                                  18133887298.441562272235520

Commenti

La rappresentazione binaria di Decimal un numero è costituita da un segno a 1 bit, da un numero intero a 96 bit e da un fattore di scala utilizzato per dividere il numero intero e specificare quale parte di esso è una frazione decimale.The binary representation of a Decimal number consists of a 1-bit sign, a 96-bit integer number, and a scaling factor used to divide the integer number and specify what portion of it is a decimal fraction. Il fattore di scala è implicitamente il numero 10, elevato a un esponente compreso tra 0 e 28.The scaling factor is implicitly the number 10, raised to an exponent ranging from 0 to 28.

bitsè una matrice lunga a quattro elementi di interi con segno a 32 bit.bits is a four-element long array of 32-bit signed integers.

bits[0], bits [1] e bits [2] contengono i bit minimo, medio e alto 32 del numero intero a 96 bit.bits [0], bits [1], and bits [2] contain the low, middle, and high 32 bits of the 96-bit integer number.

bits[3] contiene il fattore di scala e il segno ed è costituito dalle parti seguenti:bits [3] contains the scale factor and sign, and consists of following parts:

I bit da 0 a 15, ovvero la parola inferiore, sono inutilizzati e devono essere pari a zero.Bits 0 to 15, the lower word, are unused and must be zero.

I bit da 16 a 23 devono contenere un esponente compreso tra 0 e 28, che indica la potenza di 10 per dividere il numero intero.Bits 16 to 23 must contain an exponent between 0 and 28, which indicates the power of 10 to divide the integer number.

I bits da 24 a 30 sono inutilizzati e devono essere pari a zero.Bits 24 to 30 are unused and must be zero.

Il bit 31 contiene il segno; 0 indica positivo e 1 significato negativo.Bit 31 contains the sign; 0 meaning positive, and 1 meaning negative.

Un valore numerico potrebbe avere più rappresentazioni binarie possibili. tutti sono ugualmente validi e numericamente equivalenti.A numeric value might have several possible binary representations; all are equally valid and numerically equivalent. Si noti che la rappresentazione di bit si differenzia da zero negativo a zero positivo.Note that the bit representation differentiates between negative and positive zero. Questi valori vengono considerati uguali in tutte le operazioni.These values are treated as being equal in all operations.

Vedi anche

Decimal(Int64) Decimal(Int64) Decimal(Int64) Decimal(Int64)

Inizializza una nuova istanza di Decimal sul valore dell'intero con segno a 64 bit specificato.Initializes a new instance of Decimal to the value of the specified 64-bit signed integer.

public:
 Decimal(long value);
public Decimal (long value);
new decimal : int64 -> decimal
Public Sub New (value As Long)

Parametri

value
Int64 Int64 Int64 Int64

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una Int64 struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with an Int64 value.

// Example of the Decimal( __int64 ) constructor.
using namespace System;

// Create a Decimal object and display its value.
void CreateDecimal( __int64 value, String^ valToStr )
{
   Decimal decimalNum = Decimal(value);
   
   // Format the constructor for display.
   String^ ctor = String::Format( "Decimal( {0} )", valToStr );
   
   // Display the constructor and its value.
   Console::WriteLine( "{0,-35}{1,22}", ctor, decimalNum );
}

int main()
{
   Console::WriteLine( "This example of the Decimal( __int64 ) "
   "constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-35}{1,22}", "Constructor", "Value" );
   Console::WriteLine( "{0,-35}{1,22}", "-----------", "-----" );
   
   // Construct Decimal objects from __int64 values.
   CreateDecimal( Int64::MinValue, "Int64::MinValue" );
   CreateDecimal( Int64::MaxValue, "Int64::MaxValue" );
   CreateDecimal( 0, "0" );
   CreateDecimal( 999999999999999999, "999999999999999999" );
   CreateDecimal( 0x2000000000000000, "0x2000000000000000" );
   CreateDecimal( 0xE000000000000000, "0xE000000000000000" );
}

/*
This example of the Decimal( __int64 ) constructor
generates the following output.

Constructor                                         Value
-----------                                         -----
Decimal( Int64::MinValue )           -9223372036854775808
Decimal( Int64::MaxValue )            9223372036854775807
Decimal( 0 )                                            0
Decimal( 999999999999999999 )          999999999999999999
Decimal( 0x2000000000000000 )         2305843009213693952
Decimal( 0xE000000000000000 )        -2305843009213693952
*/
// Example of the decimal( long ) constructor.
using System;

class DecimalCtorLDemo
{
    // Create a decimal object and display its value.
    public static void CreateDecimal( long value, string valToStr )
    {
        decimal decimalNum = new decimal( value );

        // Format the constructor for display.
        string ctor = String.Format( "decimal( {0} )", valToStr );

        // Display the constructor and its value.
        Console.WriteLine( "{0,-35}{1,22}", ctor, decimalNum );
    }
    
    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal( long ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-35}{1,22}", "Constructor", "Value" );
        Console.WriteLine( "{0,-35}{1,22}", "-----------", "-----" );

        // Construct decimal objects from long values.
        CreateDecimal( long.MinValue, "long.MinValue" );
        CreateDecimal( long.MaxValue, "long.MaxValue" );
        CreateDecimal( 0L, "0L" );
        CreateDecimal( 999999999999999999, "999999999999999999" );
        CreateDecimal( 0x2000000000000000, "0x2000000000000000" );
        CreateDecimal( unchecked( (long)0xE000000000000000 ), 
            "(long)0xE000000000000000" );
    }
}

/*
This example of the decimal( long ) constructor
generates the following output.

Constructor                                         Value
-----------                                         -----
decimal( long.MinValue )             -9223372036854775808
decimal( long.MaxValue )              9223372036854775807
decimal( 0 )                                            0
decimal( 999999999999999999 )          999999999999999999
decimal( 0x2000000000000000 )         2305843009213693952
decimal( (long)0xE000000000000000 )  -2305843009213693952
*/
' Example of the Decimal( Long ) constructor.
Module DecimalCtorLDemo

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As Long, valToStr As String )

        Dim decimalNum As New Decimal( value )

        ' Format the constructor for display.
        Dim ctor As String = _
            String.Format( "Decimal( {0} )", valToStr )

        ' Display the constructor and its value.
        Console.WriteLine( "{0,-30}{1,22}", ctor, decimalNum )
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( Long ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-30}{1,22}", "Constructor", "Value" )
        Console.WriteLine( "{0,-30}{1,22}", "-----------", "-----" )

        ' Construct Decimal objects from Long values.
        CreateDecimal( Long.MinValue, "Long.MinValue" )                
        CreateDecimal( Long.MaxValue, "Long.MaxValue" )                
        CreateDecimal( 0L, "0" )                
        CreateDecimal( 999999999999999999, "999999999999999999" )                
        CreateDecimal( &H2000000000000000, "&H2000000000000000" )                
        CreateDecimal( &HE000000000000000, "&HE000000000000000" )                
    End Sub 
End Module 

' This example of the Decimal( Long ) constructor
' generates the following output.
' 
' Constructor                                    Value
' -----------                                    -----
' Decimal( Long.MinValue )        -9223372036854775808
' Decimal( Long.MaxValue )         9223372036854775807
' Decimal( 0 )                                       0
' Decimal( 999999999999999999 )     999999999999999999
' Decimal( &H2000000000000000 )    2305843009213693952
' Decimal( &HE000000000000000 )   -2305843009213693952

Decimal(Single) Decimal(Single) Decimal(Single) Decimal(Single)

Inizializza una nuova istanza di Decimal sul valore del numero a virgola mobile a precisione singola specificato.Initializes a new instance of Decimal to the value of the specified single-precision floating-point number.

public:
 Decimal(float value);
public Decimal (float value);
new decimal : single -> decimal
Public Sub New (value As Single)

Parametri

value
Single Single Single Single

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Eccezioni

value è maggiore di MaxValue o minore di MinValue.value is greater than MaxValue or less than MinValue.

-oppure--or- value è NaN, PositiveInfinity o NegativeInfinity.value is NaN, PositiveInfinity, or NegativeInfinity.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una Single struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with a Single value.

// Example of the Decimal( float ) constructor.
using namespace System;

// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}


// Create a Decimal object and display its value.
void CreateDecimal( float value, String^ valToStr )
{
   
   // Format and display the constructor.
   Console::Write( "{0,-27}", String::Format( "Decimal( {0} )", valToStr ) );
   try
   {
      
      // Construct the Decimal value.
      Decimal decimalNum = Decimal(value);
      
      // Display the value if it was created successfully.
      Console::WriteLine( "{0,31}", decimalNum );
   }
   catch ( Exception^ ex ) 
   {
      
      // Display the exception type if an exception was thrown.
      Console::WriteLine( "{0,31}", GetExceptionType( ex ) );
   }

}

int main()
{
   Console::WriteLine( "This example of the Decimal( float ) "
   "constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-27}{1,31}", "Constructor", "Value or Exception" );
   Console::WriteLine( "{0,-27}{1,31}", "-----------", "------------------" );
   
   // Construct Decimal objects from float values.
   CreateDecimal( 1.2345E+5, "1.2345E+5" );
   CreateDecimal( 1.234567E+15, "1.234567E+15" );
   CreateDecimal( 1.23456789E+25, "1.23456789E+25" );
   CreateDecimal( 1.23456789E+35, "1.23456789E+35" );
   CreateDecimal( 1.2345E-5, "1.2345E-5" );
   CreateDecimal( 1.234567E-15, "1.234567E-15" );
   CreateDecimal( 1.23456789E-25, "1.23456789E-25" );
   CreateDecimal( 1.23456789E-35, "1.23456789E-35" );
   CreateDecimal( 1.0 / 7.0, "1.0 / 7.0" );
}

/*
This example of the Decimal( float ) constructor
generates the following output.

Constructor                             Value or Exception
-----------                             ------------------
Decimal( 1.2345E+5 )                                123450
Decimal( 1.234567E+15 )                   1234567000000000
Decimal( 1.23456789E+25 )       12345680000000000000000000
Decimal( 1.23456789E+35 )                OverflowException
Decimal( 1.2345E-5 )                           0.000012345
Decimal( 1.234567E-15 )            0.000000000000001234567
Decimal( 1.23456789E-25 )   0.0000000000000000000000001235
Decimal( 1.23456789E-35 )                                0
Decimal( 1.0 / 7.0 )                             0.1428571
*/
// Example of the decimal( float ) constructor.
using System;

class DecimalCtorSDemo
{
    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( float value, string valToStr )
    {
        // Format and display the constructor.
        Console.Write( "{0,-27}", 
            String.Format( "decimal( {0} )", valToStr ) );

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( value );

            // Display the value if it was created successfully.
            Console.WriteLine( "{0,31}", decimalNum );
        }
        catch( Exception ex )
        {
            // Display the exception type if an exception was thrown.
            Console.WriteLine( "{0,31}", GetExceptionType( ex ) );
        }
    }
    
    public static void Main( )
    {

        Console.WriteLine( "This example of the decimal( float ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-27}{1,31}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-27}{1,31}", "-----------", 
            "------------------" );

        // Construct decimal objects from float values.
        CreateDecimal( 1.2345E+5F, "1.2345E+5F" );
        CreateDecimal( 1.234567E+15F, "1.234567E+15F" );
        CreateDecimal( 1.23456789E+25F, "1.23456789E+25F" );
        CreateDecimal( 1.23456789E+35F, "1.23456789E+35F" );
        CreateDecimal( 1.2345E-5F, "1.2345E-5F" );
        CreateDecimal( 1.234567E-15F, "1.234567E-15F" );
        CreateDecimal( 1.23456789E-25F, "1.23456789E-25F" );
        CreateDecimal( 1.23456789E-35F, "1.23456789E-35F" );
        CreateDecimal( 1.0F / 7.0F, "1.0F / 7.0F" );
    }
}

/*
This example of the decimal( float ) constructor
generates the following output.

Constructor                             Value or Exception
-----------                             ------------------
decimal( 1.2345E+5F )                               123450
decimal( 1.234567E+15F )                  1234567000000000
decimal( 1.23456789E+25F )      12345680000000000000000000
decimal( 1.23456789E+35F )               OverflowException
decimal( 1.2345E-5F )                          0.000012345
decimal( 1.234567E-15F )           0.000000000000001234567
decimal( 1.23456789E-25F )  0.0000000000000000000000001235
decimal( 1.23456789E-35F )                               0
decimal( 1.0F / 7.0F )                           0.1428571
*/
' Example of the Decimal( Single ) constructor.
Module DecimalCtorSDemo

    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As Single, valToStr As String )

        ' Format and display the constructor.
        Console.Write( "{0,-27}", _
            String.Format( "Decimal( {0} )", valToStr ) )

        ' Construct the Decimal value.
        Try
            Dim decimalNum As New Decimal( value )

            ' Display the value if it was created successfully.
            Console.WriteLine( "{0,31}", decimalNum )

        ' Display the exception type if an exception was thrown.
        Catch ex As Exception
            Console.WriteLine( "{0,31}", GetExceptionType( ex ) )
        End Try
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( Single ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-27}{1,31}", "Constructor", "Value or Exception" )
        Console.WriteLine( "{0,-27}{1,31}", "-----------", "------------------" )

        ' Construct Decimal objects from Single values.
        CreateDecimal( 1.2345E+5, "1.2345E+5" )                
        CreateDecimal( 1.234567E+15, "1.234567E+15" )                
        CreateDecimal( 1.23456789E+25, "1.23456789E+25" )                
        CreateDecimal( 1.23456789E+35, "1.23456789E+35" )                
        CreateDecimal( 1.2345E-5, "1.2345E-5" )                
        CreateDecimal( 1.234567E-15, "1.234567E-15" )                
        CreateDecimal( 1.23456789E-25, "1.23456789E-25" )                
        CreateDecimal( 1.23456789E-35, "1.23456789E-35" )                
        CreateDecimal( 1.0 / 7.0, "1.0 / 7.0" )                
    End Sub 
End Module 

' This example of the Decimal( Single ) constructor
' generates the following output.
' 
' Constructor                             Value or Exception
' -----------                             ------------------
' Decimal( 1.2345E+5 )                                123450
' Decimal( 1.234567E+15 )                   1234567000000000
' Decimal( 1.23456789E+25 )       12345680000000000000000000
' Decimal( 1.23456789E+35 )                OverflowException
' Decimal( 1.2345E-5 )                           0.000012345
' Decimal( 1.234567E-15 )            0.000000000000001234567
' Decimal( 1.23456789E-25 )   0.0000000000000000000000001235
' Decimal( 1.23456789E-35 )                                0
' Decimal( 1.0 / 7.0 )                             0.1428571

Commenti

Questo costruttore arrotonda value a 7 cifre significative usando l'arrotondamento al più vicino.This constructor rounds value to 7 significant digits using rounding to nearest. Questa operazione viene eseguita anche se il numero ha più di 7 cifre e le cifre meno significative sono pari a zero.This is done even if the number has more than 7 digits and the less significant digits are zero.

Decimal(UInt32) Decimal(UInt32) Decimal(UInt32) Decimal(UInt32)

Importante

Questa API non è conforme a CLS.

Inizializza una nuova istanza di Decimal sul valore dell'intero senza segno a 32 bit specificato.Initializes a new instance of Decimal to the value of the specified 32-bit unsigned integer.

public:
 Decimal(System::UInt32 value);
[System.CLSCompliant(false)]
public Decimal (uint value);
new decimal : uint32 -> decimal
Public Sub New (value As UInteger)

Parametri

value
UInt32 UInt32 UInt32 UInt32

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una UInt32 struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with a UInt32 value.

// Example of the Decimal( unsigned int ) constructor.
using namespace System;

// Create a Decimal object and display its value.
void CreateDecimal( unsigned int value, String^ valToStr )
{
   Decimal decimalNum = Decimal(value);
   
   // Format the constructor for display.
   String^ ctor = String::Format( "Decimal( {0} )", valToStr );
   
   // Display the constructor and its value.
   Console::WriteLine( "{0,-30}{1,16}", ctor, decimalNum );
}

int main()
{
   Console::WriteLine( "This example of the Decimal( unsigned "
   "int ) constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-30}{1,16}", "Constructor", "Value" );
   Console::WriteLine( "{0,-30}{1,16}", "-----------", "-----" );
   
   // Construct Decimal objects from unsigned int values.
   CreateDecimal( UInt32::MinValue, "UInt32::MinValue" );
   CreateDecimal( UInt32::MaxValue, "UInt32::MaxValue" );
   CreateDecimal( Int32::MaxValue, "Int32::MaxValue" );
   CreateDecimal( 999999999, "999999999" );
   CreateDecimal( 0x40000000, "0x40000000" );
   CreateDecimal( 0xC0000000, "0xC0000000" );
}

/*
This example of the Decimal( unsigned int ) constructor
generates the following output.

Constructor                              Value
-----------                              -----
Decimal( UInt32::MinValue )                  0
Decimal( UInt32::MaxValue )         4294967295
Decimal( Int32::MaxValue )          2147483647
Decimal( 999999999 )                 999999999
Decimal( 0x40000000 )               1073741824
Decimal( 0xC0000000 )               3221225472
*/
// Example of the decimal( uint ) constructor.
using System;

class DecimalCtorUIDemo
{
    // Create a decimal object and display its value.
    public static void CreateDecimal( uint value, string valToStr )
    {
        decimal decimalNum = new decimal( value );

        // Format the constructor for display.
        string ctor = String.Format( "decimal( {0} )", valToStr );

        // Display the constructor and its value.
        Console.WriteLine( "{0,-33}{1,16}", ctor, decimalNum );
    }
    
    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal( uint ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-33}{1,16}", "Constructor", "Value" );
        Console.WriteLine( "{0,-33}{1,16}", "-----------", "-----" );

        // Construct decimal objects from uint values.
        CreateDecimal( uint.MinValue, "uint.MinValue" );
        CreateDecimal( uint.MaxValue, "uint.MaxValue" );
        CreateDecimal( (uint)int.MaxValue, "(uint)int.MaxValue" );
        CreateDecimal( 999999999U, "999999999U" );
        CreateDecimal( 0x40000000U, "0x40000000U" );
        CreateDecimal( 0xC0000000, "0xC0000000" );
    }
}

/*
This example of the decimal( uint ) constructor
generates the following output.

Constructor                                 Value
-----------                                 -----
decimal( uint.MinValue )                        0
decimal( uint.MaxValue )               4294967295
decimal( (uint)int.MaxValue )          2147483647
decimal( 999999999U )                   999999999
decimal( 0x40000000U )                 1073741824
decimal( 0xC0000000 )                  3221225472
*/
' Example of the Decimal( UInt32 ) constructor.
Module DecimalCtorUIDemo

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As UInt32, valToStr As String )

        Dim decimalNum As New Decimal( value )

        ' Format the constructor for display.
        Dim ctor As String = _
            String.Format( "Decimal( {0} )", valToStr )

        ' Display the constructor and its value.
        Console.WriteLine( "{0,-33}{1,16}", ctor, decimalNum )
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( UInt32 ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-33}{1,16}", "Constructor", "Value" )
        Console.WriteLine( "{0,-33}{1,16}", "-----------", "-----" )

        ' Construct Decimal objects from UInt32 values.
        ' UInt32.MinValue and UInt32.MaxValue are not defined in VB.
        CreateDecimal( Convert.ToUInt32( 0 ), """UInt32.MinValue""" )
        CreateDecimal( Convert.ToUInt32( 4294967295 ), _
            """UInt32.MaxValue""" )
        CreateDecimal( Convert.ToUInt32( Integer.MaxValue ), _
            "Integer.MaxValue" )              
        CreateDecimal( Convert.ToUInt32( 999999999 ), "999999999" ) 
        CreateDecimal( Convert.ToUInt32( &H40000000 ), "&H40000000" ) 
        CreateDecimal( Convert.ToUInt32( &HC0000000L ), "&HC0000000" )
    End Sub 
End Module 

' This example of the Decimal( UInt32 ) constructor
' generates the following output.
' 
' Constructor                                 Value
' -----------                                 -----
' Decimal( "UInt32.MinValue" )                    0
' Decimal( "UInt32.MaxValue" )           4294967295
' Decimal( Integer.MaxValue )            2147483647
' Decimal( 999999999 )                    999999999
' Decimal( &H40000000 )                  1073741824
' Decimal( &HC0000000 )                  3221225472

Decimal(UInt64) Decimal(UInt64) Decimal(UInt64) Decimal(UInt64)

Importante

Questa API non è conforme a CLS.

Inizializza una nuova istanza di Decimal sul valore dell'intero senza segno a 64 bit specificato.Initializes a new instance of Decimal to the value of the specified 64-bit unsigned integer.

public:
 Decimal(System::UInt64 value);
[System.CLSCompliant(false)]
public Decimal (ulong value);
new decimal : uint64 -> decimal
Public Sub New (value As ULong)

Parametri

value
UInt64 UInt64 UInt64 UInt64

Valore da rappresentare come Decimal.The value to represent as a Decimal.

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una UInt64 struttura con un valore.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with a UInt64 value.

// Example of the Decimal( unsigned __int64 ) constructor.
using namespace System;

// Create a Decimal object and display its value.
void CreateDecimal( unsigned __int64 value, String^ valToStr )
{
   Decimal decimalNum = Decimal(value);
   
   // Format the constructor for display.
   String^ ctor = String::Format( "Decimal( {0} )", valToStr );
   
   // Display the constructor and its value.
   Console::WriteLine( "{0,-33}{1,22}", ctor, decimalNum );
}

int main()
{
   Console::WriteLine( "This example of the Decimal( unsigned "
   "__int64 ) constructor \ngenerates the following output.\n" );
   Console::WriteLine( "{0,-33}{1,22}", "Constructor", "Value" );
   Console::WriteLine( "{0,-33}{1,22}", "-----------", "-----" );
   
   // Construct Decimal objects from unsigned __int64 values.
   CreateDecimal( UInt64::MinValue, "UInt64::MinValue" );
   CreateDecimal( UInt64::MaxValue, "UInt64::MaxValue" );
   CreateDecimal( Int64::MaxValue, "Int64::MaxValue" );
   CreateDecimal( 999999999999999999, "999999999999999999" );
   CreateDecimal( 0x2000000000000000, "0x2000000000000000" );
   CreateDecimal( 0xE000000000000000, "0xE000000000000000" );
}

/*
This example of the Decimal( unsigned __int64 ) constructor
generates the following output.

Constructor                                       Value
-----------                                       -----
Decimal( UInt64::MinValue )                           0
Decimal( UInt64::MaxValue )        18446744073709551615
Decimal( Int64::MaxValue )          9223372036854775807
Decimal( 999999999999999999 )        999999999999999999
Decimal( 0x2000000000000000 )       2305843009213693952
Decimal( 0xE000000000000000 )      16140901064495857664
*/
// Example of the decimal( ulong ) constructor.
using System;

class DecimalCtorLDemo
{
    // Create a decimal object and display its value.
    public static void CreateDecimal( ulong value, string valToStr )
    {
        decimal decimalNum = new decimal( value );

        // Format the constructor for display.
        string ctor = String.Format( "decimal( {0} )", valToStr );

        // Display the constructor and its value.
        Console.WriteLine( "{0,-35}{1,22}", ctor, decimalNum );
    }
    
    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal( ulong ) " +
            "constructor \ngenerates the following output.\n" );
        Console.WriteLine( "{0,-35}{1,22}", "Constructor", "Value" );
        Console.WriteLine( "{0,-35}{1,22}", "-----------", "-----" );

        // Construct decimal objects from ulong values.
        CreateDecimal( ulong.MinValue, "ulong.MinValue" );
        CreateDecimal( ulong.MaxValue, "ulong.MaxValue" );
        CreateDecimal( long.MaxValue, "long.MaxValue" );
        CreateDecimal( 999999999999999999, "999999999999999999" );
        CreateDecimal( 0x2000000000000000, "0x2000000000000000" );
        CreateDecimal( 0xE000000000000000, "0xE000000000000000" );
    }
}

/*
This example of the decimal( ulong ) constructor
generates the following output.

Constructor                                         Value
-----------                                         -----
decimal( ulong.MinValue )                               0
decimal( ulong.MaxValue )            18446744073709551615
decimal( long.MaxValue )              9223372036854775807
decimal( 999999999999999999 )          999999999999999999
decimal( 0x2000000000000000 )         2305843009213693952
decimal( 0xE000000000000000 )        16140901064495857664
*/
' Example of the Decimal( UInt64 ) constructor.
Module DecimalCtorULDemo

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( value As UInt64, valToStr As String )

        Dim decimalNum As New Decimal( value )

        ' Format the constructor for display.
        Dim ctor As String = _
            String.Format( "Decimal( {0} )", valToStr )

        ' Display the constructor and its value.
        Console.WriteLine( "{0,-33}{1,22}", ctor, decimalNum )
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( UInt64 ) constructor " & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-33}{1,22}", "Constructor", "Value" )
        Console.WriteLine( "{0,-33}{1,22}", "-----------", "-----" )

        ' Construct Decimal objects from UInt64 values.
        ' UInt64.MinValue and UInt64.MaxValue are not defined in VB.
        CreateDecimal( Convert.ToUInt64( 0 ), """UInt64.MinValue""" )
        CreateDecimal( Convert.ToUInt64( 18446744073709551615D ), _
            """UInt64.MaxValue""" )
        CreateDecimal( Convert.ToUInt64( Long.MaxValue ), _
            "Long.MaxValue" )              
        CreateDecimal( Convert.ToUInt64( 999999999999999999 ), _
            "999999999999999999" )                
        CreateDecimal( Convert.ToUInt64( &H2000000000000000 ), _
            "&H2000000000000000" )                
        CreateDecimal( Convert.ToUInt64( 16140901064495857664.0 ), _
            "16140901064495857664.0" )                
    End Sub 
End Module 

' This example of the Decimal( UInt64 ) constructor
' generates the following output.
' 
' Constructor                                       Value
' -----------                                       -----
' Decimal( "UInt64.MinValue" )                          0
' Decimal( "UInt64.MaxValue" )       18446744073709551615
' Decimal( Long.MaxValue )            9223372036854775807
' Decimal( 999999999999999999 )        999999999999999999
' Decimal( &H2000000000000000 )       2305843009213693952
' Decimal( 16140901064495857664.0 )  16140901064495857664

Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte) Decimal(Int32, Int32, Int32, Boolean, Byte)

Inizializza una nuova istanza di Decimal dai parametri che specificano le parti costitutive dell'istanza.Initializes a new instance of Decimal from parameters specifying the instance's constituent parts.

public:
 Decimal(int lo, int mid, int hi, bool isNegative, System::Byte scale);
public Decimal (int lo, int mid, int hi, bool isNegative, byte scale);
new decimal : int * int * int * bool * byte -> decimal
Public Sub New (lo As Integer, mid As Integer, hi As Integer, isNegative As Boolean, scale As Byte)

Parametri

lo
Int32 Int32 Int32 Int32

32 bit bassi di un intero a 96 bit.The low 32 bits of a 96-bit integer.

mid
Int32 Int32 Int32 Int32

32 bit medi di un intero a 96 bit.The middle 32 bits of a 96-bit integer.

hi
Int32 Int32 Int32 Int32

32 bit bassi di un intero a 96 bit.The high 32 bits of a 96-bit integer.

isNegative
Boolean Boolean Boolean Boolean

true per indicare un numero negativo; false per indicare un numero positivo.true to indicate a negative number; false to indicate a positive number.

scale
Byte Byte Byte Byte

Potenza di 10 compresa tra 0 e 28.A power of 10 ranging from 0 to 28.

Eccezioni

Esempi

Nell'esempio di codice seguente vengono Decimal creati diversi numeri utilizzando l'overload del costruttore Decimal che Inizializza una Int32 struttura con tre parole Boolean di valore, un Byte segno e un fattore di scala.The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with three Int32 value words, a Boolean sign, and a Byte scale factor.

// Example of the Decimal( int, int, int, bool, unsigned char ) 
// constructor.
using namespace System;

// Get the exception type name; remove the namespace prefix.
String^ GetExceptionType( Exception^ ex )
{
   String^ exceptionType = ex->GetType()->ToString();
   return exceptionType->Substring( exceptionType->LastIndexOf( '.' ) + 1 );
}


// Create a Decimal object and display its value.
void CreateDecimal( int low, int mid, int high, bool isNeg, unsigned char scale )
{
   
   // Format the constructor for display.
   array<Object^>^boxedParams = gcnew array<Object^>(5);
   boxedParams[ 0 ] = low;
   boxedParams[ 1 ] = mid;
   boxedParams[ 2 ] = high;
   boxedParams[ 3 ] = isNeg;
   boxedParams[ 4 ] = scale;
   String^ ctor = String::Format( "Decimal( {0}, {1}, {2}, {3}, {4} )", boxedParams );
   String^ valOrExc;
   try
   {
      
      // Construct the Decimal value.
      Decimal decimalNum = Decimal(low,mid,high,isNeg,scale);
      
      // Format and save the Decimal value.
      valOrExc = decimalNum.ToString();
   }
   catch ( Exception^ ex ) 
   {
      
      // Save the exception type if an exception was thrown.
      valOrExc = GetExceptionType( ex );
   }

   
   // Display the constructor and Decimal value or exception.
   int ctorLen = 76 - valOrExc->Length;
   
   // Display the data on one line if it will fit.
   if ( ctorLen > ctor->Length )
      Console::WriteLine( "{0}{1}", ctor->PadRight( ctorLen ), valOrExc );
   // Otherwise, display the data on two lines.
   else
   {
      Console::WriteLine( "{0}", ctor );
      Console::WriteLine( "{0,76}", valOrExc );
   }
}

int main()
{
   Console::WriteLine( "This example of the Decimal( int, int, "
   "int, bool, unsigned char ) \nconstructor "
   "generates the following output.\n" );
   Console::WriteLine( "{0,-38}{1,38}", "Constructor", "Value or Exception" );
   Console::WriteLine( "{0,-38}{1,38}", "-----------", "------------------" );
   
   // Construct Decimal objects from double values.
   CreateDecimal( 0, 0, 0, false, 0 );
   CreateDecimal( 0, 0, 0, false, 27 );
   CreateDecimal( 0, 0, 0, true, 0 );
   CreateDecimal( 1000000000, 0, 0, false, 0 );
   CreateDecimal( 0, 1000000000, 0, false, 0 );
   CreateDecimal( 0, 0, 1000000000, false, 0 );
   CreateDecimal( 1000000000, 1000000000, 1000000000, false, 0 );
   CreateDecimal(  -1, -1, -1, false, 0 );
   CreateDecimal(  -1, -1, -1, true, 0 );
   CreateDecimal(  -1, -1, -1, false, 15 );
   CreateDecimal(  -1, -1, -1, false, 28 );
   CreateDecimal(  -1, -1, -1, false, 29 );
   CreateDecimal( Int32::MaxValue, 0, 0, false, 18 );
   CreateDecimal( Int32::MaxValue, 0, 0, false, 28 );
   CreateDecimal( Int32::MaxValue, 0, 0, true, 28 );
}

/*
This example of the Decimal( int, int, int, bool, unsigned char )
constructor generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
Decimal( 0, 0, 0, False, 0 )                                               0
Decimal( 0, 0, 0, False, 27 )                                              0
Decimal( 0, 0, 0, True, 0 )                                                0
Decimal( 1000000000, 0, 0, False, 0 )                             1000000000
Decimal( 0, 1000000000, 0, False, 0 )                    4294967296000000000
Decimal( 0, 0, 1000000000, False, 0 )          18446744073709551616000000000
Decimal( 1000000000, 1000000000, 1000000000, False, 0 )
                                               18446744078004518913000000000
Decimal( -1, -1, -1, False, 0 )                79228162514264337593543950335
Decimal( -1, -1, -1, True, 0 )                -79228162514264337593543950335
Decimal( -1, -1, -1, False, 15 )              79228162514264.337593543950335
Decimal( -1, -1, -1, False, 28 )              7.9228162514264337593543950335
Decimal( -1, -1, -1, False, 29 )                 ArgumentOutOfRangeException
Decimal( 2147483647, 0, 0, False, 18 )                  0.000000002147483647
Decimal( 2147483647, 0, 0, False, 28 )        0.0000000000000000002147483647
Decimal( 2147483647, 0, 0, True, 28 )        -0.0000000000000000002147483647
*/
// Example of the decimal( int, int, int, bool, byte ) constructor.
using System;

class DecimalCtorIIIBByDemo
{
    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( int low, int mid, int high, 
        bool isNeg, byte scale )
    {
        // Format the constructor for display.
        string ctor = String.Format( 
            "decimal( {0}, {1}, {2}, {3}, {4} )", 
            low, mid, high, isNeg, scale );
        string valOrExc;

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( 
                low, mid, high, isNeg, scale );

            // Format and save the decimal value.
            valOrExc = decimalNum.ToString( );
        }
        catch( Exception ex )
        {
            // Save the exception type if an exception was thrown.
            valOrExc = GetExceptionType( ex );
        }

        // Display the constructor and decimal value or exception.
        int ctorLen = 76 - valOrExc.Length;

        // Display the data on one line if it will fit.
        if ( ctorLen > ctor.Length )
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), 
                valOrExc );

        // Otherwise, display the data on two lines.
        else
        {
            Console.WriteLine( "{0}", ctor );
            Console.WriteLine( "{0,76}", valOrExc );
        }
    }
    
    public static void Main( )
    {

        Console.WriteLine( "This example of the decimal( int, int, " +
            "int, bool, byte ) \nconstructor " +
            "generates the following output.\n" );
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-38}{1,38}", "-----------", 
            "------------------" );

        // Construct decimal objects from the component fields.
        CreateDecimal( 0, 0, 0, false, 0 );
        CreateDecimal( 0, 0, 0, false, 27 );
        CreateDecimal( 0, 0, 0, true, 0 );
        CreateDecimal( 1000000000, 0, 0, false, 0 );
        CreateDecimal( 0, 1000000000, 0, false, 0 );
        CreateDecimal( 0, 0, 1000000000, false, 0 );
        CreateDecimal( 1000000000, 1000000000, 1000000000, false, 0 );
        CreateDecimal( -1, -1, -1, false, 0 );
        CreateDecimal( -1, -1, -1, true, 0 );
        CreateDecimal( -1, -1, -1, false, 15 );
        CreateDecimal( -1, -1, -1, false, 28 );
        CreateDecimal( -1, -1, -1, false, 29 );
        CreateDecimal( int.MaxValue, 0, 0, false, 18 );
        CreateDecimal( int.MaxValue, 0, 0, false, 28 );
        CreateDecimal( int.MaxValue, 0, 0, true, 28 );
    }
}

/*
This example of the decimal( int, int, int, bool, byte )
constructor generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
decimal( 0, 0, 0, False, 0 )                                               0
decimal( 0, 0, 0, False, 27 )                                              0
decimal( 0, 0, 0, True, 0 )                                                0
decimal( 1000000000, 0, 0, False, 0 )                             1000000000
decimal( 0, 1000000000, 0, False, 0 )                    4294967296000000000
decimal( 0, 0, 1000000000, False, 0 )          18446744073709551616000000000
decimal( 1000000000, 1000000000, 1000000000, False, 0 )
                                               18446744078004518913000000000
decimal( -1, -1, -1, False, 0 )                79228162514264337593543950335
decimal( -1, -1, -1, True, 0 )                -79228162514264337593543950335
decimal( -1, -1, -1, False, 15 )              79228162514264.337593543950335
decimal( -1, -1, -1, False, 28 )              7.9228162514264337593543950335
decimal( -1, -1, -1, False, 29 )                 ArgumentOutOfRangeException
decimal( 2147483647, 0, 0, False, 18 )                  0.000000002147483647
decimal( 2147483647, 0, 0, False, 28 )        0.0000000000000000002147483647
decimal( 2147483647, 0, 0, True, 28 )        -0.0000000000000000002147483647
*/
' Example of the Decimal( Integer, Integer, Integer, Boolean, Byte ) 
' constructor.
Module DecimalCtorIIIBByDemo

    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Create a Decimal object and display its value.
    Sub CreateDecimal( low As Integer, mid As Integer, _
        high As Integer, isNeg As Boolean, scale as Byte )

        ' Format the constructor for display.
        Dim ctor As String = String.Format( _
            "Decimal( {0}, {1}, {2}, {3}, {4} )", _
            low, mid, high, isNeg, scale )
        Dim valOrExc As String

        ' Construct the Decimal value.
        Try
            Dim decimalNum As New Decimal( _
                low, mid, high, isNeg, scale )

            ' Format and save the Decimal value.
            valOrExc = decimalNum.ToString( )

        ' Save the exception type if an exception was thrown.
        Catch ex As Exception
            valOrExc =  GetExceptionType( ex ) 
        End Try

        ' Display the constructor and Decimal value or exception.
        Dim ctorLen = 76 - valOrExc.Length
        If ctorLen > ctor.Length Then

            ' Display the data on one line if it will fit.
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), _
                valOrExc )

        ' Otherwise, display the data on two lines.
        Else
            Console.WriteLine( "{0}", ctor )
            Console.WriteLine( "{0,76}", valOrExc )
        End If
    End Sub
    
    Sub Main( )

        Console.WriteLine( _
            "This example of the Decimal( Integer, Integer, " & _
            "Integer, Boolean, Byte ) " & vbCrLf & "constructor " & _
            "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", _
            "Value or Exception" )
        Console.WriteLine( "{0,-38}{1,38}", "-----------", _
            "------------------" )

        ' Construct Decimal objects from the component fields.
        CreateDecimal( 0, 0, 0, False, 0 )                
        CreateDecimal( 0, 0, 0, False, 27 )                
        CreateDecimal( 0, 0, 0, True, 0 )                
        CreateDecimal( 1000000000, 0, 0, False, 0 )                
        CreateDecimal( 0, 1000000000, 0, False, 0 )                
        CreateDecimal( 0, 0, 1000000000, False, 0 )                
        CreateDecimal( 1000000000, 1000000000, 1000000000, False, 0 )
        CreateDecimal( -1, -1, -1, False, 0 )                
        CreateDecimal( -1, -1, -1, True, 0 )                
        CreateDecimal( -1, -1, -1, False, 15 )                
        CreateDecimal( -1, -1, -1, False, 28 )                
        CreateDecimal( -1, -1, -1, False, 29 )                
        CreateDecimal( Integer.MaxValue, 0, 0, False, 18 )                
        CreateDecimal( Integer.MaxValue, 0, 0, False, 28 )                
        CreateDecimal( Integer.MaxValue, 0, 0, True, 28 )                
    End Sub 
End Module 

' This example of the Decimal( Integer, Integer, Integer, Boolean, Byte )
' constructor generates the following output.
' 
' Constructor                                               Value or Exception
' -----------                                               ------------------
' Decimal( 0, 0, 0, False, 0 )                                               0
' Decimal( 0, 0, 0, False, 27 )                                              0
' Decimal( 0, 0, 0, True, 0 )                                                0
' Decimal( 1000000000, 0, 0, False, 0 )                             1000000000
' Decimal( 0, 1000000000, 0, False, 0 )                    4294967296000000000
' Decimal( 0, 0, 1000000000, False, 0 )          18446744073709551616000000000
' Decimal( 1000000000, 1000000000, 1000000000, False, 0 )
'                                                18446744078004518913000000000
' Decimal( -1, -1, -1, False, 0 )                79228162514264337593543950335
' Decimal( -1, -1, -1, True, 0 )                -79228162514264337593543950335
' Decimal( -1, -1, -1, False, 15 )              79228162514264.337593543950335
' Decimal( -1, -1, -1, False, 28 )              7.9228162514264337593543950335
' Decimal( -1, -1, -1, False, 29 )                 ArgumentOutOfRangeException
' Decimal( 2147483647, 0, 0, False, 18 )                  0.000000002147483647
' Decimal( 2147483647, 0, 0, False, 28 )        0.0000000000000000002147483647
' Decimal( 2147483647, 0, 0, True, 28 )        -0.0000000000000000002147483647

Nell'esempio seguente viene usato GetBits il metodo per recuperare le parti componente di una matrice.The following example uses the GetBits method to retrieve the component parts of an array. USA quindi questa matrice nella chiamata al Decimal(Int32, Int32, Int32, Boolean, Byte) costruttore per creare un'istanza di un nuovo Decimal valore.It then uses this array in the call to the Decimal(Int32, Int32, Int32, Boolean, Byte) constructor to instantiate a new Decimal value.

using System;

public class Example
{
   public static void Main()
   {
      Decimal[] values = { 1234.96m, -1234.96m };
      foreach (var value in values) {
         int[] parts = Decimal.GetBits(value);
         bool sign = (parts[3] & 0x80000000) != 0;
   
         byte scale = (byte) ((parts[3] >> 16) & 0x7F); 
         Decimal newValue = new Decimal(parts[0], parts[1], parts[2], sign, scale);
         Console.WriteLine("{0} --> {1}", value, newValue);
      }
   }
}
// The example displays the following output:
//       1234.96 --> 1234.96
//       -1234.96 --> -1234.96
Module Example
   Public Sub Main()
      Dim values() As Decimal = { 1234.96d, -1234.96d }
      For Each value In values
         Dim parts() = Decimal.GetBits(value)
         Dim sign As Boolean = (parts(3) And &h80000000) <> 0
         Dim scale As Byte = CByte((parts(3) >> 16) And &H7F)
   
         Dim newValue As New Decimal(parts(0), parts(1), parts(2), sign, scale)    
         Console.WriteLine("{0} --> {1}", value, newValue)
      Next   
   End Sub
End Module
' The example displays the following output:
'    1234.96 --> 1234.96
'    -1234.96 --> -1234.96

Commenti

La rappresentazione binaria di Decimal un numero è costituita da un segno a 1 bit, da un numero intero a 96 bit e da un fattore di scala utilizzato per dividere il numero intero e specificare quale parte di esso è una frazione decimale.The binary representation of a Decimal number consists of a 1-bit sign, a 96-bit integer number, and a scaling factor used to divide the integer number and specify what portion of it is a decimal fraction. Il fattore di scala è implicitamente il numero 10 elevato a un esponente compreso tra 0 e 28.The scaling factor is implicitly the number 10 raised to an exponent ranging from 0 to 28.

Si applica a