using System;

​

public class Rectangle : Shape

{

    private double length;

    private double width;

    public double Length

    {

        get

        {

            return length;

        }

        set

        {

            length = value;

        }

    }

    public double Width

    {

        get

        {

            return width;

        }

        set

        {

            width = value;

        }

    }

​

    public double getArea()

    {

        double area = 0.0;

        area = Length*Width;

        return area;

    }

​

    public string toString()

    {

        string rectstring;

        rectstring = "The length of the figure is " + Length.ToString() + " while the width is " + Width.ToString();

        return rectstring;

    }

​

    public Rectangle()

    {

        length = 0.0;

        width = 0.0;

    }

    public Rectangle(double a, double b)

    {

        length = a;

        width = b;

    }

    public static void Main()

    {

        Rectangle rectangle1 = new Rectangle(3, 4);

        Console.WriteLine("The length is: " + rectangle1.Length);

        Console.WriteLine("The width is: " + rectangle1.Width);

        Console.WriteLine("The area is: " + rectangle1.getArea());

        Console.WriteLine(rectangle1.toString());

        rectangle1.Length = 2;

        rectangle1.Width = 9; 

        Console.WriteLine(); //spacer

        Console.WriteLine("The length is: " + rectangle1.Length);

        Console.WriteLine("The width is: " + rectangle1.Width);

        Console.WriteLine("The area is: " + rectangle1.getArea());

        Console.WriteLine(rectangle1.toString());

    }

}

​

​

interface Shape

{

    double getArea();

}