using System;

namespace PolymorphismApplication

{

 class Printdata

    {

      

        class Shape

        {

            protected int width, height;

            public Shape(int a = 0, int b = 0)

            {

                width = a;

                height = b;

            }

            public virtual int area()

            {

                Console.WriteLine("Parent class area :");

                return 0;

            }

        }

        class Rectangle : Shape

        {

            public Rectangle(int a = 0, int b = 0)

                : base(a, b)

            {

            }

            public override int area()

            {

                Console.WriteLine("Rectangle class area :");

                return (width * height);

            }

        }

        class Triangle : Shape

        {

            public Triangle(int a = 0, int b = 0)

                : base(a, b)

            {

            }

            public override int area()

            {

                Console.WriteLine("Triangle class area :");

                return (width * height / 2);

            }

        }

        class Caller

        {

            public void CallArea(Shape sh)

            {

                int a;

                a = sh.area();

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

            }

        }

        class Tester

        {

           static void Main(string[] args)

            {

                Caller c = new Caller();

                Rectangle r = new Rectangle(10, 7);

                Triangle t = new Triangle(10, 5);

                c.CallArea(r);

                c.CallArea(t);

                Console.ReadKey();

            }

        }

    }

}