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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: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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