Decimal.Decrement(Decimal) 運算子

定義

Decimal 運算元減一。Decrements the Decimal operand by one.

public:
 static System::Decimal operator --(System::Decimal d);
public static decimal operator -- (decimal d);
static member op_Decrement : decimal -> decimal
Public Shared op_Decrement (d As Decimal) As Decimal

參數

d
Decimal

要遞減的值。The value to decrement.

傳回

d 減一的值。The value of d decremented by 1.

例外狀況

傳回值小於 MinValue 或大於 MaxValueThe return value is less than MinValue or greater than MaxValue.

備註

Decrement 方法會定義 Decimal 值之遞減運算子的運算。The Decrement method defines the operation of the decrement operator for Decimal values. 它會啟用如下所示的程式碼:It enables code such as the following:

using System;

public class Example
{
   public static void Main()
   {
      Decimal number = 1079.8m;
      Console.WriteLine("Original value:    {0:N}", number);
      Console.WriteLine("Decremented value: {0:N}", --number); 
   }
}
// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80

缺少遞增運算子的某些語言(例如 Visual Basic)可以直接呼叫 Decrement 方法,如下列範例所示。Some languages (such as Visual Basic) that lack an increment operator can call the Decrement method directly, as the following example shows.

Module Example
   Public Sub Main()
      Dim number As Decimal = 1079.8d
      Console.WriteLine("Original value:    {0:N}", number)
      Console.WriteLine("Decremented value: {0:N}", Decimal.op_Decrement(number))
   End Sub
End Module
' The example displays the following output:
'       Original value:    1,079.80
'       Decremented value: 1,078.80

如果您的語言不支援自訂運算子,請改為呼叫 Subtract 方法,如下列範例所示。If your language does not support custom operators, call the Subtract method instead, as the following example shows.

using System;

public class Example
{
   public static void Main()
   {
      Decimal number = 1079.8m;
      Console.WriteLine("Original value:    {0:N}", number);
      Console.WriteLine("Decremented value: {0:N}", Decimal.Subtract(number, 1)); 
   }
}
// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80
Module Example
   Public Sub Main()
      Dim number As Decimal = 1079.8d
      Console.WriteLine("Original value:    {0:N}", number)
      Console.WriteLine("Decremented value: {0:N}", Decimal.Subtract(number, 1))
   End Sub
End Module
' The example displays the following output:
'       Original value:    1,079.80
'       Decremented value: 1,078.80

適用於

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