Int64 Struct

Definition

Represents a 64-bit signed integer.

``public value class Int64 : IComparable, IComparable<long>, IConvertible, IEquatable<long>, IFormattable``
``````[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public struct Int64 : IComparable, IComparable<long>, IConvertible, IEquatable<long>, IFormattable``````
``````type int64 = struct
interface IFormattable
interface IConvertible``````
``````Public Structure Int64
Implements IComparable, IComparable(Of Long), IConvertible, IEquatable(Of Long), IFormattable``````
Inheritance
Attributes
Implements

Remarks

Int64 is an immutable value type that represents signed integers with values that range from negative 9,223,372,036,854,775,808 (which is represented by the Int64.MinValue constant) through positive 9,223,372,036,854,775,807 (which is represented by the Int64.MaxValue constant. The .NET Framework also includes an unsigned 64-bit integer value type, UInt64, which represents values that range from 0 to 18,446,744,073,709,551,615.

Instantiating an Int64 Value

You can instantiate an Int64 value in several ways:

• You can declare an Int64 variable and assign it a literal integer value that is within the range of the Int64 data type. The following example declares two Int64 variables and assigns them values in this way.

``````long number1 = -64301728;
long number2 = 255486129307;
``````
``````Dim number1 As Long = -64301728
Dim number2 As Long = 255486129307
``````
• You can assign the value of an integral type whose range is a subset of the Int64 type. This is a widening conversion that does not require a cast operator in C# or a conversion method in Visual Basic.

``````sbyte value1 = 124;
short value2 = 1618;
int value3 = Int32.MaxValue;

long number1 = value1;
long number2 = value2;
long number3 = value3;
``````
``````Dim value1 As SByte = 124
Dim value2 As Int16 = 1618
Dim value3 As Int32 = Int32.MaxValue

Dim number1 As Long = value1
Dim number2 As Long = value2
Dim number3 As Long = value3
``````
• You can assign the value of a numeric type whose range exceeds that of the Int64 type. This is a narrowing conversion, so it requires a cast operator in C# and a conversion method in Visual Basic if `Option Strict` is on. If the numeric value is a Single, Double, or Decimal value that includes a fractional component, the handling of its fractional part depends on the compiler performing the conversion. The following example performs narrowing conversions to assign several numeric values to Int64 variables.

``````ulong ulNumber = 163245617943825;
try {
long number1 = (long) ulNumber;
Console.WriteLine(number1);
}
catch (OverflowException) {
Console.WriteLine("{0} is out of range of an Int64.", ulNumber);
}

double dbl2 = 35901.997;
try {
long number2 = (long) dbl2;
Console.WriteLine(number2);
}
catch (OverflowException) {
Console.WriteLine("{0} is out of range of an Int64.", dbl2);
}

BigInteger bigNumber = (BigInteger) 1.63201978555e30;
try {
long number3 = (long) bigNumber;
Console.WriteLine(number3);
}
catch (OverflowException) {
Console.WriteLine("{0} is out of range of an Int64.", bigNumber);
}
// The example displays the following output:
//    163245617943825
//    35902
//    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.
``````
``````Dim ulNumber As ULong = 163245617943825
Try
Dim number1 As Long = CLng(ulNumber)
Console.WriteLine(number1)
Catch e As OverflowException
Console.WriteLine("{0} is out of range of an Int64.", ulNumber)
End Try

Dim dbl2 As Double = 35901.997
Try
Dim number2 As Long = CLng(dbl2)
Console.WriteLine(number2)
Catch e As OverflowException
Console.WriteLine("{0} is out of range of an Int64.", dbl2)
End Try

Dim bigNumber As BigInteger = 1.63201978555e30
Try
Dim number3 As Long = CLng(bigNumber)
Console.WriteLine(number3)
Catch e As OverflowException
Console.WriteLine("{0:N0} is out of range of an Int64.", bigNumber)
End Try
' The example displays the following output:
'    163245617943825
'    35902
'    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.
``````
• You can call a method of the Convert class to convert any supported type to an Int64 value. This is possible because Int64 supports the IConvertible interface. The following example illustrates the conversion of an array of Decimal values to Int64 values.

``````decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
199.55m, 9214.16m, Decimal.MaxValue };
long result;

foreach (decimal value in values)
{
try {
result = Convert.ToInt64(value);
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
value.GetType().Name, value,
result.GetType().Name, result);
}
catch (OverflowException) {
Console.WriteLine("{0} is outside the range of the Int64 type.",
value);
}
}
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the Int64 type.
//    Converted the Decimal value '-1034.23' to the Int64 value -1034.
//    Converted the Decimal value '-12' to the Int64 value -12.
//    Converted the Decimal value '0' to the Int64 value 0.
//    Converted the Decimal value '147' to the Int64 value 147.
//    Converted the Decimal value '199.55' to the Int64 value 200.
//    Converted the Decimal value '9214.16' to the Int64 value 9214.
//    79228162514264337593543950335 is outside the range of the Int64 type.
``````
``````Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Long

For Each value As Decimal In values
Try
result = Convert.ToInt64(value)
Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
value.GetType().Name, value, _
result.GetType().Name, result)
Catch e As OverflowException
Console.WriteLine("{0} is outside the range of the Int64 type.", _
value)
End Try
Next
' The example displays the following output:
'    -79228162514264337593543950335 is outside the range of the Int64 type.
'    Converted the Decimal value '-1034.23' to the Int64 value -1034.
'    Converted the Decimal value '-12' to the Int64 value -12.
'    Converted the Decimal value '0' to the Int64 value 0.
'    Converted the Decimal value '147' to the Int64 value 147.
'    Converted the Decimal value '199.55' to the Int64 value 200.
'    Converted the Decimal value '9214.16' to the Int64 value 9214.
'    79228162514264337593543950335 is outside the range of the Int64 type.
``````
• You can call the Parse or TryParse method to convert the string representation of an Int64 value to an Int64. The string can contain either decimal or hexadecimal digits. The following example illustrates the parse operation by using both a decimal and a hexadecimal string.

``````string string1 = "244681903147";
try {
long number1 = Int64.Parse(string1);
Console.WriteLine(number1);
}
catch (OverflowException) {
Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string1);
}
catch (FormatException) {
Console.WriteLine("The format of '{0}' is invalid.", string1);
}

string string2 = "F9A3CFF0A";
try {
long number2 = Int64.Parse(string2,
System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(number2);
}
catch (OverflowException) {
Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string2);
}
catch (FormatException) {
Console.WriteLine("The format of '{0}' is invalid.", string2);
}
// The example displays the following output:
//    244681903147
//    67012198154
``````
``````Dim string1 As String = "244681903147"
Try
Dim number1 As Long = Int64.Parse(string1)
Console.WriteLine(number1)
Catch e As OverflowException
Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string1)
Catch e As FormatException
Console.WriteLine("The format of '{0}' is invalid.", string1)
End Try

Dim string2 As String = "F9A3CFF0A"
Try
Dim number2 As Long = Int64.Parse(string2,
System.Globalization.NumberStyles.HexNumber)
Console.WriteLine(number2)
Catch e As OverflowException
Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string2)
Catch e As FormatException
Console.WriteLine("The format of '{0}' is invalid.", string2)
End Try
' The example displays the following output:
'    244681903147
'    67012198154
``````

Performing Operations on Int64 Values

The Int64 type supports standard mathematical operations such as addition, subtraction, division, multiplication, negation, and unary negation. Like the other integral types, the Int64 type also supports the bitwise `AND`, `OR`, `XOR`, left shift, and right shift operators.

You can use the standard numeric operators to compare two Int64 values, or you can call the CompareTo or Equals method.

You can also call the members of the Math class to perform a wide range of numeric operations, including getting the absolute value of a number, calculating the quotient and remainder from integral division, determining the maximum or minimum value of two long integers, getting the sign of a number, and rounding a number.

Representing an Int64 as a String

The Int64 type provides full support for standard and custom numeric format strings. (For more information, see Formatting Types, Standard Numeric Format Strings, and Custom Numeric Format Strings.)

To format an Int64 value as an integral string with no leading zeros, you can call the parameterless ToString() method. By using the "D" format specifier, you can also include a specified number of leading zeros in the string representation. By using the "N" format specifier, you can include group separators and specify the number of decimal digits to appear in the string representation of the number. By using the "X" format specifier, you can represent an Int64 value as a hexadecimal string. The following example formats the elements in an array of Int64 values in these four ways.

``````long[] numbers = { -1403, 0, 169, 1483104 };
foreach (var number in numbers) {
// Display value using default formatting.
Console.Write("{0,-8}  -->   ", number.ToString());
// Display value with 3 digits and leading zeros.
Console.Write("{0,8:D3}", number);
// Display value with 1 decimal digit.
Console.Write("{0,13:N1}", number);
// Display value as hexadecimal.
Console.Write("{0,18:X2}", number);
// Display value with eight hexadecimal digits.
Console.WriteLine("{0,18:X8}", number);
}
// The example displays the following output:
//    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
//    0         -->        000          0.0                00          00000000
//    169       -->        169        169.0                A9          000000A9
//    1483104   -->    1483104  1,483,104.0            16A160          0016A160
``````
``````Dim numbers() As Long = { -1403, 0, 169, 1483104 }
For Each number In numbers
' Display value using default formatting.
Console.Write("{0,-8}  -->   ", number.ToString())
' Display value with 3 digits and leading zeros.
Console.Write("{0,8:D3}", number)
' Display value with 1 decimal digit.
Console.Write("{0,13:N1}", number)
' Display value as hexadecimal.
Console.Write("{0,18:X2}", number)
' Display value with eight hexadecimal digits.
Console.WriteLine("{0,18:X8}", number)
Next
' The example displays the following output:
'    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
'    0         -->        000          0.0                00          00000000
'    169       -->        169        169.0                A9          000000A9
'    1483104   -->    1483104  1,483,104.0            16A160          0016A160
``````

You can also format an Int64 value as a binary, octal, decimal, or hexadecimal string by calling the ToString(Int64, Int32) method and supplying the base as the method's second parameter. The following example calls this method to display the binary, octal, and hexadecimal representations of an array of integer values.

``````long[] numbers = { -146, 11043, 2781913 };
foreach (var number in numbers) {
Console.WriteLine("{0} (Base 10):", number);
Console.WriteLine("   Binary:  {0}", Convert.ToString(number, 2));
Console.WriteLine("   Octal:   {0}", Convert.ToString(number, 8));
Console.WriteLine("   Hex:     {0}\n", Convert.ToString(number, 16));
}
// The example displays the following output:
//    -146 (Base 10):
//       Binary:  1111111111111111111111111111111111111111111111111111111101101110
//       Octal:   1777777777777777777556
//       Hex:     ffffffffffffff6e
//
//    11043 (Base 10):
//       Binary:  10101100100011
//       Octal:   25443
//       Hex:     2b23
//
//    2781913 (Base 10):
//       Binary:  1010100111001011011001
//       Octal:   12471331
//       Hex:     2a72d9
``````
``````Dim numbers() As Long = { -146, 11043, 2781913 }
For Each number In numbers
Console.WriteLine("{0} (Base 10):", number)
Console.WriteLine("   Binary:  {0}", Convert.ToString(number, 2))
Console.WriteLine("   Octal:   {0}", Convert.ToString(number, 8))
Console.WriteLine("   Hex:     {0}", Convert.ToString(number, 16))
Console.WriteLine()
Next
' The example displays the following output:
'    -146 (Base 10):
'       Binary:  1111111111111111111111111111111111111111111111111111111101101110
'       Octal:   1777777777777777777556
'       Hex:     ffffffffffffff6e
'
'    11043 (Base 10):
'       Binary:  10101100100011
'       Octal:   25443
'       Hex:     2b23
'
'    2781913 (Base 10):
'       Binary:  1010100111001011011001
'       Octal:   12471331
'       Hex:     2a72d9
``````

Working with Non-Decimal 32-Bit Integer Values

In addition to working with individual long integers as decimal values, you may want to perform bitwise operations with long integer values, or work with the binary or hexadecimal representations of long integer values. Int64 values are represented in 63 bits, with the sixty-fourth bit used as a sign bit. Positive values are represented by using sign-and-magnitude representation. Negative values are in two's complement representation. This is important to keep in mind when you perform bitwise operations on Int64 values or when you work with individual bits. In order to perform a numeric, Boolean, or comparison operation on any two non-decimal values, both values must use the same representation.

Fields

 Represents the largest possible value of an `Int64`. This field is constant. Represents the smallest possible value of an `Int64`. This field is constant.

Methods

 Compares this instance to a specified 64-bit signed integer and returns an indication of their relative values. Compares this instance to a specified object and returns an indication of their relative values. Returns a value indicating whether this instance is equal to a specified Int64 value. Returns a value indicating whether this instance is equal to a specified object. Returns the hash code for this instance. Returns the TypeCode for value type Int64. Converts the span representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent. Converts the string representation of a number to its 64-bit signed integer equivalent. Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent. Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent. Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent. Converts the numeric value of this instance to its equivalent string representation. Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information. Converts the numeric value of this instance to its equivalent string representation, using the specified format. Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information. Tries to format the value of the current long number instance into the provided span of characters. Converts the span representation of a number to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed. Converts the span representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed. Converts the string representation of a number to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed. Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed.

Explicit Interface Implementations

 Compares this instance to a specified object and returns an indication of their relative values. Returns the TypeCode for value type Int64. For a description of this member, see ToBoolean(IFormatProvider). For a description of this member, see ToByte(IFormatProvider). For a description of this member, see ToChar(IFormatProvider). This conversion is not supported. Attempting to use this method throws an InvalidCastException. For a description of this member, see ToDecimal(IFormatProvider). For a description of this member, see ToDouble(IFormatProvider). For a description of this member, see ToInt16(IFormatProvider). For a description of this member, see ToInt32(IFormatProvider). For a description of this member, see ToInt64(IFormatProvider). For a description of this member, see ToSByte(IFormatProvider). For a description of this member, see ToSingle(IFormatProvider). For a description of this member, see ToType(Type, IFormatProvider). For a description of this member, see ToUInt16(IFormatProvider). For a description of this member, see ToUInt32(IFormatProvider). For a description of this member, see ToUInt64(IFormatProvider).

Thread Safety

All members of this type are thread safe. Members that appear to modify instance state actually return a new instance initialized with the new value. As with any other type, reading and writing to a shared variable that contains an instance of this type must be protected by a lock to guarantee thread safety.