C# Math Round(Decimal, Int32, MidpointRounding)

Description

Math Round(Decimal, Int32, MidpointRounding) rounds a decimal value to a specified number of fractional digits. A parameter specifies how to round the value if it is midway between two numbers.

Syntax

Math.Round(Decimal, Int32, MidpointRounding) has the following syntax.

public static decimal Round(
  decimal d,//  w w w . j  a  v a2  s . c  om
  int decimals,
  MidpointRounding mode
)

Parameters

Math.Round(Decimal, Int32, MidpointRounding) has the following parameters.

• d - A decimal number to be rounded.
• decimals - The number of decimal places in the return value.
• mode - Specification for how to round d if it is midway between two other numbers.

Returns

Math.Round(Decimal, Int32, MidpointRounding) method returns The number nearest to d that contains a number of fractional digits equal to decimals. If d has fewer fractional digits than decimals, d is returned unchanged.

Example

The following code shows how to use Math.Round(Decimal, Int32, MidpointRounding) method.

using System;//  w ww .j  a  va2 s.  c o m

public class Example
{
   public static void Main()
   {
      decimal[] values = { 2.125M, 2.135M, 2.145M, 3.125M, 3.135M, 3.145M };
      foreach (double value in values)
         Console.WriteLine("{0} --> {1}", value, 
                           Math.Round(value, 2, MidpointRounding.AwayFromZero));

   }
}

The code above generates the following result.