Decimal 単項マイナス演算子

[アーティクル]
03/28/2008

指定した Decimal オペランドの値を無効にします。

returnValue = Decimal.op_UnaryNegation(d)
[C#]
public static decimal operator -(decimald);
[C++]
public: static Decimal op_UnaryNegation(Decimald);
[JScript]
returnValue = -d;

[Visual Basic] Visual Basic では、この型で定義されている演算子を使用することができます。ただし、独自に定義することはできません。Negate メソッドを Decimal 単項マイナス演算子の代わりに使用することができます。

[JScript] JScript では、この型で定義されている演算子を使用することができます。ただし、独自に定義することはできません。

引数 [Visual Basic, JScript]

d
Decimal オペランド。

パラメータ [C#, C++]

d
Decimal オペランド。

戻り値

d に -1 を乗算した結果。

使用例

[Visual Basic, C#, C++] Decimal の複数の値に Unary Negation 演算子を適用するコード例を次に示します。

 
' Example of the Decimal increment, decrement, unary negation, and 
' unary plus operators.
Imports System
Imports Microsoft.VisualBasic

Module DecIncrDecrUnaryDemo
    
    ' 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

    ' Display the argument and the incremented and decremented values.
    Sub DecIncrDecrUnary( argument as Decimal )

        Dim toBeIncr As Decimal = argument
        Dim toBeDecr As Decimal = argument

        Console.WriteLine( "{0,-36}{1}", "Decimal argument: ", _
            argument )

        ' The op_Increment and op_Decrement operators must be 
        ' explicitly coded in Visual Basic.

        ' Catch the exception if the increment operator throws one.
        Console.Write( "{0,-36}", "Decimal.op_Increment( argument )" )
        Try
            toBeIncr = Decimal.op_Increment( toBeIncr )
            Console.WriteLine( "{0}", toBeIncr )
        Catch ex As Exception
            Console.WriteLine( "{0}", GetExceptionType( ex ) )
        End Try

        ' Catch the exception if the decrement operator throws one.
        Console.Write( "{0,-36}", "Decimal.op_Decrement( argument )" )
        Try
            toBeDecr = Decimal.op_Decrement( toBeDecr )
            Console.WriteLine( "{0}", toBeDecr )
        Catch ex As Exception
            Console.WriteLine( "{0}", GetExceptionType( ex ) )
        End Try
            
        Console.WriteLine( )
    End Sub

    Sub Main( )
        Console.WriteLine( _
            "This example of the Decimal increment, decrement, " & _
            "unary negation, " & vbCrLf & "and unary plus " & _
            "operators generates the following output. It " & vbCrLf & _
            "displays the results of the operators on several " & _
            "Decimal values." & vbCrLf  )

        ' Create objects to compare with the reference.
        DecIncrDecrUnary( 0.000000123D )
        DecIncrDecrUnary( New Decimal( 123000000, 0, 0, false, 9 ) )

        ' The op_UnaryNegation and op_UnaryPlus operators must be
        ' explicitly coded in Visual Basic. If unary + or - is used,
        ' other methods are called.
        DecIncrDecrUnary( Decimal.op_UnaryNegation( _
            New Decimal( 123000000, 0, 0, false, 9 ) ) )
        DecIncrDecrUnary( Decimal.op_UnaryPlus( Decimal.MaxValue ) )
        DecIncrDecrUnary( Decimal.op_UnaryNegation( Decimal.MaxValue ) )
        DecIncrDecrUnary( Decimal.op_UnaryPlus( _
            7.5000000000000000000000000001D ) )
    End Sub
End Module 

' This example of the Decimal increment, decrement, unary negation,
' and unary plus operators generates the following output. It
' displays the results of the operators on several Decimal values.
' 
' Decimal argument:                   0.000000123
' Decimal.op_Increment( argument )    1.000000123
' Decimal.op_Decrement( argument )    -0.999999877
' 
' Decimal argument:                   0.123000000
' Decimal.op_Increment( argument )    1.123000000
' Decimal.op_Decrement( argument )    -0.877000000
' 
' Decimal argument:                   -0.123000000
' Decimal.op_Increment( argument )    0.877000000
' Decimal.op_Decrement( argument )    -1.123000000
' 
' Decimal argument:                   79228162514264337593543950335
' Decimal.op_Increment( argument )    OverflowException
' Decimal.op_Decrement( argument )    79228162514264337593543950334
' 
' Decimal argument:                   -79228162514264337593543950335
' Decimal.op_Increment( argument )    -79228162514264337593543950334
' Decimal.op_Decrement( argument )    OverflowException
' 
' Decimal argument:                   7.5000000000000000000000000001
' Decimal.op_Increment( argument )    8.500000000000000000000000000
' Decimal.op_Decrement( argument )    6.5000000000000000000000000001

[C#] 
// Example of the decimal increment, decrement, unary negation, and 
// unary plus operators.
using System;

class DecIncrDecrUnaryDemo
{
    // 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 );
    }

    // Display the argument and the incremented and decremented values.
    public static void DecIncrDecrUnary( decimal argument )
    {
        decimal toBeIncr = argument;
        decimal toBeDecr = argument;

        Console.WriteLine( "{0,-26}{1}", "decimal argument: ", 
            argument );

        // Catch the exception if the increment operator throws one.
        Console.Write( "{0,-26}", "argument ++" );
        try
        {
            toBeIncr ++;
            Console.WriteLine( "{0}", toBeIncr );
        }
        catch( Exception ex )
        {
            Console.WriteLine( "{0}", GetExceptionType( ex ) );
        }

        // Catch the exception if the decrement operator throws one.
        Console.Write( "{0,-26}", "argument --" );
        try
        {
            toBeDecr --;
            Console.WriteLine( "{0}", toBeDecr );
        }
        catch( Exception ex )
        {
            Console.WriteLine( "{0}", GetExceptionType( ex ) );
        }
            
        Console.WriteLine( );
    }

    public static void Main( )
    {
        Console.WriteLine( "This example of the decimal increment, " +
            "decrement, unary negation, \nand unary plus operators " +
            "generates the following output. It \ndisplays the " +
            "results of the operators on several decimal values.\n" );

        // Create objects to compare with the reference.
        DecIncrDecrUnary( 0.000000123M );
        DecIncrDecrUnary( new decimal( 123000000, 0, 0, false, 9 ) );
        DecIncrDecrUnary( - new decimal( 123000000, 0, 0, false, 9 ) );
        DecIncrDecrUnary( + decimal.MaxValue );
        DecIncrDecrUnary( - decimal.MaxValue );
        DecIncrDecrUnary( + 7.5000000000000000000000000001M );
    }
}

/*
This example of the decimal increment, decrement, unary negation,
and unary plus operators generates the following output. It
displays the results of the operators on several decimal values.

decimal argument:         0.000000123
argument ++               1.000000123
argument --               -0.999999877

decimal argument:         0.123000000
argument ++               1.123000000
argument --               -0.877000000

decimal argument:         -0.123000000
argument ++               0.877000000
argument --               -1.123000000

decimal argument:         79228162514264337593543950335
argument ++               OverflowException
argument --               79228162514264337593543950334

decimal argument:         -79228162514264337593543950335
argument ++               -79228162514264337593543950334
argument --               OverflowException

decimal argument:         7.5000000000000000000000000001
argument ++               8.500000000000000000000000000
argument --               6.5000000000000000000000000001
*/

[C++] 
// Example of the Decimal increment, decrement, unary negation, and 
// unary plus operators.
#using <mscorlib.dll>
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 );
}

// Display the argument and the incremented and decremented values.
void DecIncrDecrUnary( Decimal argument )
{
    Decimal toBeIncr = argument;
    Decimal toBeDecr = argument;

    Console::WriteLine( S"{0,-26}{1}", S"Decimal argument: ", 
        __box( argument ) );

    // Catch the exception if the increment operator throws one.
    Console::Write( S"{0,-26}", S"argument ++" );
    try
    {
        toBeIncr ++;
        Console::WriteLine( S"{0}", __box( toBeIncr ) );
    }
    catch( Exception* ex )
    {
        Console::WriteLine( S"{0}", GetExceptionType( ex ) );
    }

    // Catch the exception if the decrement operator throws one.
    Console::Write( S"{0,-26}", S"argument --" );
    try
    {
        toBeDecr --;
        Console::WriteLine( S"{0}", __box( toBeDecr ) );
    }
    catch( Exception* ex )
    {
        Console::WriteLine( S"{0}", GetExceptionType( ex ) );
    }
        
    Console::WriteLine( );
}

void main( )
{
    Console::WriteLine( S"This example of the Decimal increment, " 
        S"decrement, unary negation, \nand unary plus operators " 
        S"generates the following output. It \ndisplays the " 
        S"results of the operators on several Decimal values.\n" );

    // Create objects to compare with the reference.
    DecIncrDecrUnary( Decimal::Parse( S"0.000000123" ) );
    DecIncrDecrUnary( Decimal( 123000000, 0, 0, false, 9 ) );
    DecIncrDecrUnary( - Decimal( 123000000, 0, 0, false, 9 ) );
    DecIncrDecrUnary( + Decimal::MaxValue );
    DecIncrDecrUnary( - Decimal::MaxValue );
    DecIncrDecrUnary( 
        + Decimal::Parse( S"7.5000000000000000000000000001" ) );
}

/*
This example of the Decimal increment, decrement, unary negation,
and unary plus operators generates the following output. It
displays the results of the operators on several Decimal values.

Decimal argument:         0.000000123
argument ++               1.000000123
argument --               -0.999999877

Decimal argument:         0.123000000
argument ++               1.123000000
argument --               -0.877000000

Decimal argument:         -0.123000000
argument ++               0.877000000
argument --               -1.123000000

Decimal argument:         79228162514264337593543950335
argument ++               OverflowException
argument --               79228162514264337593543950334

Decimal argument:         -79228162514264337593543950335
argument ++               -79228162514264337593543950334
argument --               OverflowException

Decimal argument:         7.5000000000000000000000000001
argument ++               8.500000000000000000000000000
argument --               6.5000000000000000000000000001
*/

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタボタンをクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard

参照

Decimal 構造体 | Decimal メンバ | System 名前空間 | Negate

次の方法で共有

Decimal 単項マイナス演算子

引数 [Visual Basic, JScript]

パラメータ [C#, C++]

戻り値

使用例

必要条件

参照

その他のリソース