using System;

​

public class Program

{

    delegate string kappa(int i);

    delegate string keepo(int i, string w);

    public static void Main()

    {

        Console.WriteLine("Hello World");

        kappa kk = delegate (int w)

        {

            string st = "";

            for (int e = 0; e < w; e++)

                st += "Kappa\n";

            return st;

        }

​

        ;

        Console.WriteLine(kk(2));

        keepo ww = (w, x) =>

        {

            return x;

        }

​

        ;

        Console.WriteLine(ww(2, "asdasdasd\n"));

        Typewriter tw = new Typewriter();

        tw.xx = "qqqqqqqqqqq";

        tw.print();

        tw.dostuff();

        machine m1 = new Typewriter();

        m1.dostuff();

        m1.id = "e1";

        if (m1.isWorking())

        {

            Console.WriteLine(m1.id + " is working fine !\n");

        }

​

        pr pp = new Typewriter("bladddd");

        pp.print();

        xbase xb = new xchild();

        xb.xdo();

        xchild cb = new xchild();

        cb.xdo();

        cb.xdo();

        xb.val = "12412";

        Console.WriteLine(xb.val);

        xb = new xgchild();

        xb.xdo();

    }

}

​

public class xbase

{

    public string val

    {

        get;

        set;

    }

​

    public virtual void xdo()

    {

        Console.WriteLine("base\n");

    }

}

​

public class xchild : xbase

{

    public string cval

    {

        get;

        set;

    }

​

    public override void xdo()

    {

        Console.WriteLine("child");

    }

}

​

public class xgchild : xchild

{

    public string xgval

    {

        get;

        set;

    }

​

    override public void xdo()

    {

        Console.WriteLine("grand child");

    }

}

​

interface pr

{

    void print();

}

​

public abstract class machine

{

    public string id

    {

        get;

        set;

    }

​

    public void dostuff()

    {

        Console.WriteLine("Machine working\n");

    }

​

    public bool isWorking()

    {

        if (id != null)

            return true;

        else

            return false;

    }

}

​

public class Typewriter : machine, pr

{

    public Typewriter(string st)

    {

        this.xx = st;

    }

​

    public Typewriter()

    {

    }

​

    public string xx

    {

        get;

        set;

    }

​

    public void print()

    {

        Console.WriteLine("this is :" + this.xx);

    }

​

    new public void dostuff()

    {

        Console.WriteLine("Typewriter working\n");

    }

}