using System;  

delegate int Calc(int num);//declaring delegate  

public class Example  

{  

    static int n = 50;  

    public static int sub(int num)  

    {  

        n = n - num;  

        return n;  

    }  

    public static int mul(int num)  

    {  

        n = n * num;  

        return n;  

    }  

    public static int getnum()  

    {  

        return n;  

    }  

    public static void Main(string[] args)  

    {  

        Calc x = new Calc(sub);//instantiating delegate  

        Calc y = new Calc(mul);  

        x(10);//calling method using delegate  

        Console.WriteLine("After x delegate, Number is: " + getnum());  

        y(20);  

        Console.WriteLine("After y delegate, Number is: " + getnum());  

    }  

}