using System;

namespace csharpprog

{

    class csharprog

    {

        public int i;

        public csharprog()

        {

            i = 1;

            Console.WriteLine("Default constructor: {0}", i);

        }

        public csharprog(int a)

        {

            i = a;

            Console.WriteLine("parameter constructor: {0}", a);

        }

        public csharprog(csharprog C2)

        {

            i = C2.i;

            Console.WriteLine("Copy constructor: {0}", i);

        }

    }

    class Inherit: csharprog

    {

        public void inheritMethd()

        {

            Console.WriteLine("Value of i is: {0}", i);

        }

    }

    public class Mainprog

    {

        public static void Main()

        {

            csharprog C1 = new csharprog();

            csharprog C2 = new csharprog(5);

            csharprog C3 = new csharprog(C2);

            Inherit I = new Inherit();

            I.inheritMethd();

        }

    }

}

​