using System;

​

​

namespace ConsoleApp1

{

    delegate int arthimetic(int x,int y);

    public class Program

    {

        public static int add(int a,int b)

        {

            return (a+b);

        }

        public static int sub(int a,int b)

        {

            return (a-b);

        }

       public  static void Main(string[] args)

        {

           arthimetic op1=new arthimetic(Program.add);

           arthimetic op2=new arthimetic(Program.sub);

           int res1=op1(10,20);

           int res2=op2(30,20);

           Console.WriteLine("the result of add is {0}",res1);

            Console.WriteLine("the result of sub is {0}",res2);

​

​

​

​

        }

    }

}