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Math.Round Method (Decimal, Int32)

.NET Framework 1.1

Returns the number with the specified precision nearest the specified value.

[Visual Basic]
Overloads Public Shared Function Round( _
   ByVal d As Decimal, _
   ByVal decimals As Integer _
) As Decimal
public static decimal Round(
 decimal d,
 int decimals
public: static Decimal Round(
 Decimal d,
 int decimals
public static function Round(
   d : Decimal,
 decimals : int
) : Decimal;


A Decimal number to be rounded.
The number of significant fractional digits (precision) in the return value.

Return Value

The number nearest d with precision equal to decimals. If d is halfway between two numbers, one of which is even and the other odd, then the even number is returned. If the precision of d is less than decimals, then d is returned unchanged.


The decimals parameter specifies the number of significant fractional digits in the return value and ranges from 0 to 28. If decimals is zero, then a whole number is returned.

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. If decimals is zero, this kind of rounding is sometimes called rounding toward zero.


The following code example demonstrates rounding to nearest.

[Visual Basic] 
Math.Round(3.44, 1) 'Returns 3.4.
Math.Round(3.45, 1) 'Returns 3.4.
Math.Round(3.46, 1) 'Returns 3.5.

Math.Round(3.44, 1); //Returns 3.4.
Math.Round(3.45, 1); //Returns 3.4.
Math.Round(3.46, 1); //Returns 3.5.


Math::Round(3.44, 1); //Returns 3.4.
Math::Round(3.45, 1); //Returns 3.4.
Math::Round(3.46, 1); //Returns 3.5.

System.Math.Round(3.44, 1) //Returns 3.4.
System.Math.Round(3.45, 1) //Returns 3.4.
System.Math.Round(3.46, 1) //Returns 3.5.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

See Also

Math Class | Math Members | System Namespace | Math.Round Overload List | Ceiling | Floor