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Decimal.ToDouble Method

Converts the value of the specified Decimal to the equivalent double-precision floating-point number.

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

'Declaration
Public Shared Function ToDouble ( _
	d As Decimal _
) As Double

Parameters

d
Type: System.Decimal

The decimal number to convert.

Return Value

Type: System.Double
A double-precision floating-point number equivalent to d.

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

The following code example converts Decimal numbers to Double values using ToDouble method.

' Example of the Decimal.ToSingle and Decimal.ToDouble methods. 
Imports System
Imports Microsoft.VisualBasic

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 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

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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