Question

using System;    
using System.Math;    
class test

  {    
    public static void Main()    
      {    
        Console.Write("Enter any  value: ");    
        string s=Console.ReadLine();    
        double n = double.Parse(s);    
        double r = Math.sqrt(n);    
        Console.WriteLine(r);    
        Console.ReadKey();    
      }    
  }

I feel that every thing is clear in this code, but this code is giving compile errors:
A using namespace directive can only be applied to namespaces; ‘System.Math’ is a type not a namespace

How to use math functions?
Where do we get a list of all math functions available in Math class?

Thank You.

Answer 1

Math is a static class, not a namespace. It is located in the System namespace.
Therefore, you only have to include the System namespace.
Simply use Math.Sqrt and drop the “using System.Math;” Note that it is Math.Sqrt and not Math.sqrt

Hope that helps 😉