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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)
public static decimal Round(
	decimal d,
	int decimals
)

Parameters

d
Type: System.Decimal

A Decimal value 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.  
using System;

class DecimalRoundDemo
{
    const string dataFmt = "{0,26}{1,8}{2,26}";

    // Display decimal.Round parameters and the result. 
    public static void ShowDecimalRound( decimal Argument, int Digits )
    {
        decimal rounded = decimal.Round( Argument, Digits );

        Console.WriteLine( dataFmt, Argument, Digits, rounded );
    }

    public static void Main( )
    {
        Console.WriteLine( "This example of the " +
            "decimal.Round( decimal, Integer ) \n" +
            "method generates the following output.\n" );
        Console.WriteLine( dataFmt, "Argument", "Digits", "Result" );
        Console.WriteLine( dataFmt, "--------", "------", "------" );

        // Create pairs of decimal objects.
        ShowDecimalRound( 1.45M, 1 );
        ShowDecimalRound( 1.55M, 1 );
        ShowDecimalRound( 123.456789M, 4 );
        ShowDecimalRound( 123.456789M, 6 );
        ShowDecimalRound( 123.456789M, 8 );
        ShowDecimalRound( -123.456M, 0 );
        ShowDecimalRound( 
            new decimal( 1230000000, 0, 0, true, 7 ), 3 );
        ShowDecimalRound( 
            new decimal( 1230000000, 0, 0, true, 7 ), 11 );
        ShowDecimalRound( -9999999999.9999999999M, 9 );
        ShowDecimalRound( -9999999999.9999999999M, 10 );
    }
}

/*
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
*/

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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