System.Math un identified

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.

4 Answers

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 ;-)

You've got a case sensitivity problem

double r = Math.Sqrt(n); 

(VS.85).aspx

Starting with C# 6.0, you can use

using static System.Math; 

if you don't want to write Math. all the time.

remove using System.Math;

You do need to reference Math class like above. using System; is enough

For reference and sample use, see Math Class