Decimal.Decrement(Decimal) 運算子

定義

命名空間:

System

組件:

System.Runtime.dll

來源:

Decimal.cs

將 Decimal 運算元減一。

public:
 static System::Decimal operator --(System::Decimal d) = System::Numerics::IDecrementOperators<System::Decimal>::op_Decrement;

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。

傳回

Decimal

d 減一的值。

實作

Decrement(TSelf)

例外狀況

OverflowException

傳回值小於 Decimal.MinValue 或大於 Decimal.MaxValue。

備註

方法 Decrement 會針對 Decimal 值定義遞減運算子的作業。 它會啟用下列程式碼：

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

let number = 1079.8m
printfn $"Original value:    {number:N}"
printfn $"Decremented value: {- -number:N}"

// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80

某些語言 (例如缺少遞增運算子的 Visual Basic) 可以直接呼叫 Decrement 方法，如下列範例所示。

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。

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

open System

let number = 1079.8m
printfn $"Original value:    {number:N}"
printfn $"Decremented value: {Decimal.Subtract(number, 1):N}"

// 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

另請參閱

• Subtract(Decimal, Decimal)