using System;

public class Program

{

    //delegate 

    public delegate void AddDelegate(int a, int b);

    public delegate void MultiDelegate(int a, int b);

    //function

    public void Add(int x, int y){

        Console.WriteLine("The sum of {0} and {1} is {2}", x, y, x+y);

    }

    public void Multiply(int x, int y){

        Console.WriteLine("The product of {0} and {1} is {2}", x, y, x*y);

    }

    public static void Main()

    {

        Program obj = new Program();

        //create instace of delegate

        AddDelegate adel = new AddDelegate(obj.Add);

        //calling function

        Console.WriteLine("Single Cast Delegate");

        adel(2,3);

        Console.WriteLine("\n\nMulticast Delegate");

        //create instace of delegate

        MultiDelegate mdel = new MultiDelegate(obj.Add);

        //calling function

        mdel += obj.Multiply;

        mdel.Invoke(10,5);

    }

}