Math.Round Method (Decimal)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Rounds a decimal value to the nearest integral value.

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

Syntax

Public Shared Function Round ( _
    d As Decimal _
) As Decimal
public static decimal Round(
    decimal d
)

Parameters

Return Value

Type: System..::.Decimal
The integer nearest parameter d. If the fractional component of d is halfway between two integers, one of which is even and the other odd, then the even number is returned. Note that the method returns a Decimal type rather than an integral type.

Exceptions

Exception Condition
OverflowException

The result is outside the range of a Decimal.

Remarks

The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding to nearest, or banker's rounding. It minimizes rounding errors that result from consistently rounding a midpoint value in a single direction.

Examples

The following example demonstrates rounding to nearest.


Module Example

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.Text &= "Classic Math.Round in Visual Basic" & vbCrLf
      outputBlock.Text &= Math.Round(4.4) & vbCrLf ' 4
      outputBlock.Text &= Math.Round(4.5) & vbCrLf ' 4
      outputBlock.Text &= Math.Round(4.6) & vbCrLf ' 5
      outputBlock.Text &= Math.Round(5.5) & vbCrLf ' 6
   End Sub

End Module
using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text += "Classic Math.Round in CSharp" + "\n";
      outputBlock.Text += Math.Round(4.4) + "\n"; // 4
      outputBlock.Text += Math.Round(4.5) + "\n"; // 4
      outputBlock.Text += Math.Round(4.6) + "\n"; // 5
      outputBlock.Text += Math.Round(5.5) + "\n"; // 6
   }
}

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Platforms

Windows Phone

See Also

Reference

Math Class

Round Overload

System Namespace

Ceiling

Floor