#include <iostream>
#include <string>

using namespace std;

class rect {
    private:
        int width;
        int height;
        int area;

        void calc() {
            area=width*height;
            return;
        }

    public:
        int get_area() {
            return area;
        }

        void setsize(int w, int h) {
            // Prevent invalid numbers.
            if(w<0 || h<0) {
                cerr << "Invalid size parameter!" << endl;
                exit(-1);
            }

            width=w;
            height=h;

            calc();

            return;
        }

        void print() {
            cout << "width = " << width << endl;
            cout << "height = " << height << endl;
            cout << "area = " << area << endl;

            return;
        }

};

int main() {
    rect square;
    rect shapes[3];

    square.setsize(5,5);

    cout << square.get_area() << endl;
    square.print();
    cout << endl;

    shapes[0].setsize(3,5);
    shapes[1].setsize(2,4);
    shapes[2].setsize(1,3);

    for(int i=0;i<3;i++) {
        shapes[i].print();
        cout << endl;
    }

    return 0;
}