using System;

//delegate created

public delegate int customDelegate(int a,int b);                    

public class Program

{

    public static void Main()

    {

        //customDelegate holds the address of sum fuction

        customDelegate del=new customDelegate(sum);

        int s=del(2,3);

        System.Console.WriteLine(s);

        //customDelegate holds the address of sum fuction

        del=sum;

        s=del(12,3);

        System.Console.WriteLine(s);

        //customDelegate holds the address of unnmaed fuction(lambda expression)

        del=(int a,int b)=>a*b;

        s=del(12,3);

        System.Console.WriteLine(s);

        //customDelegate holds the address of unnmaed fuction which can be made like this

        del= delegate (int a,int b){

            return a*b;

        };

        s=del(2,3);

        System.Console.WriteLine(s);

    }

    public static int sum(int a,int b){

        return a+b;

    }

}