Listing 6 Class rectangle derived from shape

class rectangle : public shape
       {
public:
       rectangle(palette c, double h, double w);
       double area() const;
       const char *name() const;
       ostream &put(ostream &os) const;
private:
       double height, width;
       };

rectangle::rectangle(palette c, double h, double w)
       : shape(c), height(h), width(w) { }

double rectangle::area() const
       {
       return height * width;
       }

const char *rectangle::name() const
       {
       return "rectangle";
       }

ostream &rectangle::put(ostream &os) const
       {
       return shape::put(os) << " with height = " << height
              <<" and width = " << width;
       }
// End of File