Customizing Math.Round() result in c#

Question

Math.Round() will always return results according to mathematics rules.

For Example 0.124 will be rounded off to 0.12 if done for 2 places of decimal.

Can I make it to always give me next higher value, for example 0.124 Rounded off to 2 places of decimal should give 0.13 and likewise?

http://stackoverflow.com/questions/11794579/c-sharp-round-to-decimals-always-up — online Thomas, Nov 19 '13 at 09:27

score 1 · Answer 1 · answered Nov 19 '13 at 09:28

You could use Math.Ceiling as mentioned by Baszz. You need to multiply and divide by some factor to mimic the rounding behaviour:

 var decimals = 2;
 var fac = Math.Pow(10, decimals);
 var result = ((int)Math.Ceiling(0.124 * fac)) / fac;

 Console.WriteLine(result);

Alex Filipovici · Accepted Answer · 2013-11-19T09:40:00.280

Try this:

var input = 0.124;
var decimals = 2;
var r = (input == Math.Round(input, decimals)) ? 
    Math.Round(input, decimals) : 
    Math.Round(input + Math.Pow(10, -decimals), decimals);

You could create an extension method:

public static double RoundUp(this double input, int decimals)
{
    return  (input == Math.Round(input, decimals)) ?
        Math.Round(input, decimals) :
        Math.Round(input + Math.Pow(10, -decimals), decimals);
}

and use it like:

double input = 0.1224;
var decimals = 3;
var r = input.RoundUp(decimals);

score 0 · Answer 3 · edited May 23 '17 at 12:19

0

I think you should take a look at the Math.Ceiling() method:

http://msdn.microsoft.com/en-us/library/zx4t0t48(v=vs.110).aspx

Look at this post on SO where it is explained how to use it:

How to round a decimal up?

edited May 23 '17 at 12:19

Community

1
1

answered Nov 19 '13 at 09:26

Bas Slagter

9,831
7
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78

That only rounds to integers though doesn't it? yes, it might help but this isn't really a complete answer. Especially because it is not much more than a link answer. – Chris Nov 19 '13 at 09:29

score 0 · Answer 4 · answered Nov 19 '13 at 09:34

0

for this, you try math.ceiling() instead of using math.round()..!

       Math.Round() --> Rounding values  
       Math.Ceiling()  --> Next higher value
       Math.Floor() --> Next lower value

answered Nov 19 '13 at 09:34

Vigna

113
1
5
13

score 0 · Answer 5 · answered Nov 19 '13 at 09:39

Here you go, example for Math.Ceiling() concept

   using System;

     class Program
         {
         static void Main()
         {
     // Get ceiling of double value.
      double value1 = 123.456;
      double ceiling1 = Math.Ceiling(value1);

    // Get ceiling of decimal value.
      decimal value2 = 456.789M;
      decimal ceiling2 = Math.Ceiling(value2);

    // Get ceiling of negative value.
      double value3 = -100.5;
      double ceiling3 = Math.Ceiling(value3);

    // Write values.
      Console.WriteLine(value1);
      Console.WriteLine(ceiling1);
      Console.WriteLine(value2);
      Console.WriteLine(ceiling2);
      Console.WriteLine(value3);
      Console.WriteLine(ceiling3);
      }
    }

Output
******

123.456
124
456.789
457
-100.5
-100

Customizing Math.Round() result in c#

5 Answers5