// overloading class constructors#include 
     
      using namespace std;class Rectangle {    int width, height;  public:    Rectangle ();    Rectangle (int,int);    int area (void) {
    return (width*height);}};Rectangle::Rectangle () {  width = 5;  height = 5;}Rectangle::Rectangle (int a, int b) {  width = a;  height = b;}int main () {  Rectangle rect (3,4);  Rectangle rectb;  cout << "rect area: " << rect.area() << endl;  cout << "rectb area: " << rectb.area() << endl;  return 0;}