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Decimal.Round Method (Decimal, Int32)

Rounds a Decimal value to a specified number of decimal places.

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

'Declaration
Public Shared Function Round ( _
	d As Decimal, _
	decimals As Integer _
) As Decimal

Parameters

d
Type: System.Decimal
A decimal number to round.
decimals
Type: System.Int32
A value from 0 to 28 that specifies the number of decimal places to round to.

Return Value

Type: System.Decimal
The decimal number equivalent to d rounded to decimals number of decimal places.

ExceptionCondition
ArgumentOutOfRangeException

decimals is not a value from 0 to 28.

When d is exactly halfway between two rounded values, the result is the rounded value that has an even digit in the far right decimal position. For example, when rounded to two decimals, the value 2.345 becomes 2.34 and the value 2.355 becomes 2.36. This process is known as rounding toward even, or rounding to nearest.

The following code example rounds several Decimal values to a specified number of decimal places using the Round method.


' Example of the Decimal.Round method. 
Imports System
Imports Microsoft.VisualBasic

Module DecimalRoundDemo

    Const dataFmt As String = "{0,26}{1,8}{2,26}"

    ' Display Decimal.Round parameters and the result.
    Sub ShowDecimalRound( Argument As Decimal, Digits As Integer )

        Dim rounded As Decimal = Decimal.Round( Argument, Digits )

        Console.WriteLine( dataFmt, Argument, Digits, rounded )
    End Sub

    Sub Main( )
        Console.WriteLine( "This example of the " & _
            "Decimal.Round( Decimal, Integer ) " & vbCrLf & _
            "method generates the following output." & vbCrLf )
        Console.WriteLine( dataFmt, "Argument", "Digits", "Result" )
        Console.WriteLine( dataFmt, "--------", "------", "------" )

        ' Create pairs of Decimal objects.
        ShowDecimalRound( 1.45D, 1 ) 
        ShowDecimalRound( 1.55D, 1 ) 
        ShowDecimalRound( 123.456789D, 4 ) 
        ShowDecimalRound( 123.456789D, 6 ) 
        ShowDecimalRound( 123.456789D, 8 ) 
        ShowDecimalRound( -123.456D, 0 ) 
        ShowDecimalRound( _
            New Decimal( 1230000000, 0, 0, True, 7 ), 3 )
        ShowDecimalRound( _
            New Decimal( 1230000000, 0, 0, True, 7 ), 11 )
        ShowDecimalRound( -9999999999.9999999999D, 9 )
        ShowDecimalRound( -9999999999.9999999999D, 10 )
    End Sub
End Module 

' This example of the Decimal.Round( Decimal, Integer )
' method generates the following output.
'
'                  Argument  Digits                    Result
'                  --------  ------                    ------
'                      1.45       1                       1.4
'                      1.55       1                       1.6
'                123.456789       4                  123.4568
'                123.456789       6                123.456789
'                123.456789       8                123.456789
'                  -123.456       0                      -123
'              -123.0000000       3                  -123.000
'              -123.0000000      11              -123.0000000
'    -9999999999.9999999999       9    -10000000000.000000000
'    -9999999999.9999999999      10    -9999999999.9999999999


.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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