C# 静态类

using System;
   public static class MyMath
    {
        public static float PI=3.14f; 
        public static int cube(int n){return n*n*n;}
    }
   class TestMyMath{
       public static void Main(string[] args)
        {
            Console.WriteLine("Value of PI is: "+MyMath.PI);
            Console.WriteLine("Cube of 3 is: " + MyMath.cube(3));
        }
    }

Value of PI is: 3.14
Cube of 3 is: 27