using System;

public class Base1

{

    public int length;

    public int breadth;

    public Base1(int x,int y)

    {

        length=x;

        breadth=y;

    }

    public int area()

    {

        return (length*breadth);

    }

}

public class Derived:Base1

{

    int height;

    public Derived(int x,int y,int z):base(x,y)

    {

        height=z;

    }

    public int volume()

    {

        return (length*breadth*height);

    }

}

public class ex

{

    //Base1 b1=new Base1(10,2);

    public static void Main()

    {

        Derived d1=new Derived(10,2,3);

        int area=d1.area();

        int volume=d1.volume();

        Console.WriteLine("area is {0}",area);

        Console.Write("volume is {0}",volume);

    }

}

​