/*

​

https://www.tutorialspoint.com/csharp/csharp_inheritance.htm

The derived class inherits the base class member variables and member methods. Therefore the super class object should be created before the subclass is created. You can give instructions for superclass initialization in the member initialization list.

​

*/

​

using System;

​

namespace Program

{

    public class ExecuteRectangle

    {

        public static void Main(string[] args)

        {

            RectangleApplication.Tabletop t = new RectangleApplication.Tabletop(4.5, 7.5);

            t.Display();

            Console.ReadLine();

        }

    }

}

​

namespace RectangleApplication

{

    public class Rectangle

    {

        //member variables

        protected double length;

        protected double width;

        public Rectangle(double l, double w)

        {

            length = l;

            width = w;

        }

​

        public double GetArea()

        {

            return length * width;

        }

​

        public void Display()

        {

            Console.WriteLine("Length: {0}", length);

            Console.WriteLine("Width: {0}", width);

            Console.WriteLine("Area: {0}", GetArea());

        }

    } //end class Rectangle  

​

    class Tabletop : Rectangle

    {

        private double cost;

        public Tabletop(double l, double w): base (l, w)

        {

        }

​

        public double GetCost()

        {

            double cost;

            cost = GetArea() * 70;

            return cost;

        }

​

        public void Display()

        {

            base.Display();

            Console.WriteLine("Cost: {0}", GetCost());

        }

    }

}

​

namespace RectangleApp

{

    public class Rectangle : RectangleApplication.Rectangle {};

}

​