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Decimal Explicit Conversion (Decimal to Double)

Converts a Decimal to a double-precision floating-point number.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static explicit operator double (
	decimal value
)

Parameters

value
Type: System.Decimal
The value to convert.

Return Value

Type: System.Double
A double-precision floating-point number that represents the converted Decimal.

This operation can produce round-off errors because a double-precision floating-point number has fewer significant digits than a Decimal.

This operator supports the explicit conversion of a Decimal to a Double. The syntax for such explicit conversions is language-dependent, and individual language compilers can provide different implementations and return different results. The example illustrates the different return values when you explicitly convert a Decimal value to a Double value by using C# and Visual Basic. To perform a conversion that is independent of language, you can call the ToDouble or the Convert.ToDouble(Decimal) method.

The following code example converts Decimal numbers to Double values using the explicit Decimal to Double conversion.


// Example of the explicit conversions from decimal to float and 
// decimal to double.
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 single value.
        SingleValue = (float)argument;

        // Convert the argument to a double value.
        DoubleValue = (double)argument;

        Console.WriteLine( formatter, argument, 
            SingleValue, DoubleValue );
    }

    public static void Main( )
    {
        Console.WriteLine( 
            "This example of the explicit conversions from decimal " +
            "to float \nand decimal to double generates the " +
            "following output. It displays \nseveral 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 explicit conversions from decimal to float
and decimal to double 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
*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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