#include <iostream>
using namespace std;

class Shape {
  protected:
    int width, height;
  public:
    Shape() { width = height = 0; }
    Shape(int w, int h) { width = w; height = h; }
    virtual void display() const;
};

void Shape::display() const {
  cout << width << " " << height << endl; 
}

class Rectangle : public Shape {
  public:
    Rectangle() {}
    Rectangle(int w, int h) : Shape(w, h) { }
    int perimeter() const;
    void display() const;
};

int Rectangle::perimeter() const{
  return 2 * width + 2 * height;
}

void Rectangle::display() const {
  cout << "I am rectangle of width " << width 
       << " and height " << height << endl;
}

class Triangle: public Shape {
  public:
    Triangle() {}
    Triangle(int w, int h) : Shape(w,h) {}
    void display() const;
};

void Triangle::display() const {
  cout << "I am triangle of side " << width << endl;
}


int main() {
    Shape* a[4];
    a[0] = new Rectangle(3,4);
    a[1] = new Triangle(5,7);
    a[2] = new Rectangle(10,5);
    a[3] = new Triangle(2,8);

    for (auto e: a) {
        e->display();
    }
}