using System;
namespace polymorphismApplication {
abstract class Shape {
public abstract int area();
}
class Rectangle: Shape {
private int length;
private int width;
public Rectangle( int a = 0, int b = 0) {
length = a;
width = b;
}
public override int area () {
Console.WriteLine(Rectangle class area :);
return (width * length);
}
}
class RectangleTester {
static void Main(string[] args) {
Rectangle r = new Rectangle(10, 7);
double a = r.area();
Console.WriteLine(Area: {0},a);
Console.ReadKey();
}
}
}