Classtest Set B Qn4

using System;

namespace Example
{

  interface Shape
  {
    void getData(int l, int b);
    void displayArea();
  }

  class Rectangle : Shape
  {
    private int l;
    private int b;

    public void getData(int l, int b)
    {
      this.l = l;
      this.b = b;
    }

    public void displayArea(){
        Console.WriteLine(l*b);
    }
  }

  class Square : Shape
  {
    private int l;

    public void getData(int l, int b = 0)
    {
      this.l = l;
    }

    public void displayArea(){
        Console.WriteLine(l*l);
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      Rectangle r = new Rectangle();
      r.getData(5,4);
      r.displayArea();

      Square s = new Square();
      s.getData(5);
      s.displayArea();

    }

  }
}