Decimal.ToDouble(Decimal) Methode
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Konvertiert den Wert des angegebenen Decimal in die entsprechende Gleitkommazahl mit doppelter Genauigkeit.
public:
static double ToDouble(System::Decimal d);public static double ToDouble (decimal d);static member ToDouble : decimal -> doublePublic Shared Function ToDouble (d As Decimal) As DoubleParameter
- d
- Decimal
Die zu konvertierende Dezimalzahl.
Gibt zurück
Eine Gleitkommazahl mit doppelter Genauigkeit, die d entspricht.
Beispiele
Im folgenden Codebeispiel werden Decimal Zahlen Double mithilfe der -Methode in Werte ToDouble konvertiert.
// Example of the Decimal::ToSingle and Decimal::ToDouble methods.
using namespace System;
#define formatter "{0,30}{1,17}{2,23}"
// Convert the Decimal argument; no exceptions are thrown.
void DecimalToSgl_Dbl( Decimal argument )
{
Object^ SingleValue;
Object^ DoubleValue;
// Convert the argument to a float value.
SingleValue = Decimal::ToSingle( argument );
// Convert the argument to a double value.
DoubleValue = Decimal::ToDouble( argument );
Console::WriteLine( formatter, argument, SingleValue, DoubleValue );
}
int main()
{
Console::WriteLine( "This example of the \n"
" Decimal::ToSingle( Decimal ) and \n"
" Decimal::ToDouble( Decimal ) \nmethods "
"generates the following output. It \ndisplays "
"several converted Decimal values.\n" );
Console::WriteLine( formatter, "Decimal argument", "float", "double" );
Console::WriteLine( formatter, "----------------", "-----", "------" );
// Convert Decimal values and display the results.
DecimalToSgl_Dbl( Decimal::Parse( "0.0000000000000000000000000001" ) );
DecimalToSgl_Dbl( Decimal::Parse( "0.0000000000123456789123456789" ) );
DecimalToSgl_Dbl( Decimal::Parse( "123" ) );
DecimalToSgl_Dbl( Decimal(123000000,0,0,false,6) );
DecimalToSgl_Dbl( Decimal::Parse( "123456789.123456789" ) );
DecimalToSgl_Dbl( Decimal::Parse( "123456789123456789123456789" ) );
DecimalToSgl_Dbl( Decimal::MinValue );
DecimalToSgl_Dbl( Decimal::MaxValue );
}
/*
This example of the
Decimal::ToSingle( Decimal ) and
Decimal::ToDouble( Decimal )
methods generates the following output. It
displays several converted Decimal values.
Decimal argument float double
---------------- ----- ------
0.0000000000000000000000000001 1E-28 1E-28
0.0000000000123456789123456789 1.234568E-11 1.23456789123457E-11
123 123 123
123.000000 123 123
123456789.123456789 1.234568E+08 123456789.123457
123456789123456789123456789 1.234568E+26 1.23456789123457E+26
-79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
*/
// Example of the decimal.ToSingle and decimal.ToDouble methods.
using System;
class DecimalToSgl_DblDemo
{
static string formatter = "{0,30}{1,17}{2,23}";
// Convert the decimal argument; no exceptions are thrown.
public static void DecimalToSgl_Dbl( decimal argument )
{
object SingleValue;
object DoubleValue;
// Convert the argument to a float value.
SingleValue = decimal.ToSingle( argument );
// Convert the argument to a double value.
DoubleValue = decimal.ToDouble( argument );
Console.WriteLine( formatter, argument,
SingleValue, DoubleValue );
}
public static void Main( )
{
Console.WriteLine( "This example of the \n" +
" decimal.ToSingle( decimal ) and \n" +
" decimal.ToDouble( decimal ) \nmethods " +
"generates the following output. It \ndisplays " +
"several converted decimal values.\n" );
Console.WriteLine( formatter, "decimal argument",
"float", "double" );
Console.WriteLine( formatter, "----------------",
"-----", "------" );
// Convert decimal values and display the results.
DecimalToSgl_Dbl( 0.0000000000000000000000000001M );
DecimalToSgl_Dbl( 0.0000000000123456789123456789M );
DecimalToSgl_Dbl( 123M );
DecimalToSgl_Dbl( new decimal( 123000000, 0, 0, false, 6 ) );
DecimalToSgl_Dbl( 123456789.123456789M );
DecimalToSgl_Dbl( 123456789123456789123456789M );
DecimalToSgl_Dbl( decimal.MinValue );
DecimalToSgl_Dbl( decimal.MaxValue );
}
}
/*
This example of the
decimal.ToSingle( decimal ) and
decimal.ToDouble( decimal )
methods generates the following output. It
displays several converted decimal values.
decimal argument float double
---------------- ----- ------
0.0000000000000000000000000001 1E-28 1E-28
0.0000000000123456789123456789 1.234568E-11 1.23456789123457E-11
123 123 123
123.000000 123 123
123456789.123456789 1.234568E+08 123456789.123457
123456789123456789123456789 1.234568E+26 1.23456789123457E+26
-79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
*/
' Example of the Decimal.ToSingle and Decimal.ToDouble methods.
Module DecimalToSgl_DblDemo
Dim formatter As String = "{0,30}{1,17}{2,23}"
' Convert the Decimal argument; no exceptions are thrown.
Sub DecimalToSgl_Dbl( argument As Decimal )
Dim SingleValue As Object
Dim DoubleValue As Object
' Convert the argument to a Single value.
SingleValue = Decimal.ToSingle( argument )
' Convert the argument to a Double value.
DoubleValue = Decimal.ToDouble( argument )
Console.WriteLine( formatter, argument, _
SingleValue, DoubleValue )
End Sub
Sub Main( )
Console.WriteLine( "This example of the " & vbCrLf & _
" Decimal.ToSingle( Decimal ) and " & vbCrLf & _
" Decimal.ToDouble( Decimal ) " & vbCrLf & "methods " & _
"generates the following output. It " & vbCrLf & _
"displays several converted Decimal values." & vbCrLf )
Console.WriteLine( formatter, "Decimal argument", _
"Single", "Double" )
Console.WriteLine( formatter, "----------------", _
"------", "------" )
' Convert Decimal values and display the results.
DecimalToSgl_Dbl( 0.0000000000000000000000000001D )
DecimalToSgl_Dbl( 0.0000000000112233445566778899D )
DecimalToSgl_Dbl( 123D )
DecimalToSgl_Dbl( New Decimal( 123000000, 0, 0, False, 6 ) )
DecimalToSgl_Dbl( 123456789.123456789D )
DecimalToSgl_Dbl( 123456789123456789123456789D )
DecimalToSgl_Dbl( Decimal.MinValue )
DecimalToSgl_Dbl( Decimal.MaxValue )
End Sub
End Module
' This example of the
' Decimal.ToSingle( Decimal ) and
' Decimal.ToDouble( Decimal )
' methods generates the following output. It
' displays several converted Decimal values.
'
' Decimal argument Single Double
' ---------------- ------ ------
' 0.0000000000000000000000000001 1E-28 1E-28
' 0.0000000000112233445566778899 1.122334E-11 1.12233445566779E-11
' 123 123 123
' 123.000000 123 123
' 123456789.123456789 1.234568E+08 123456789.123457
' 123456789123456789123456789 1.234568E+26 1.23456789123457E+26
' -79228162514264337593543950335 -7.922816E+28 -7.92281625142643E+28
' 79228162514264337593543950335 7.922816E+28 7.92281625142643E+28
Hinweise
Dieser Vorgang kann Zu Round-Off-Fehlern führen, da eine Gleitkommazahl mit doppelter Genauigkeit weniger signifikante Ziffern als eine Decimal aufweist.
Sie können auch Decimal Double einen mithilfe des Zuweisungsoperators in einen Wert Explicit konvertieren. Da die Konvertierung zu einem Genauigkeitsverlust führen kann, müssen Sie einen Umwandlungsoperator in C# oder eine Konvertierungsfunktion in Visual Basic verwenden.