// example: class constructor
#include <iostream>
using namespace std;

class Rectangle;

int main () {

    Rectangle rect (3,4);
    Rectangle rectb (5,6);
    cout << "rect area: " << rect.area() << endl;
    cout << "rectb area: " << rectb.area() << endl;
    return 0;
}

class Rectangle {
    int width, height;
public:
    Rectangle(int,int);
    int area () {return (width*height);}
};
Rectangle::Rectangle (int a, int b) {
    width = a;
    height = b;
}