// classes example
#include <stdio.h>

class CRectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area () {return (x*y);}
};

void CRectangle::set_values (int a, int b) {
  x = a;
  y = b;
}

int main () {
  CRectangle rect, rect2;
  rect.set_values (3,4);
  rect2.set_values(5,6);
  printf("area: %d\n", rect.area());
  printf("area2: %d\n", rect2.area());
  return 0;
}