C++多重继承

#include <iostream>

using namespace std;

// Base class Shape
class Shape {
   public:
      voID setWIDth(int w) {
         wIDth = w;
      }
      voID setHeight(int h) {
         height = h;
      }

   protected:
      int wIDth;
      int height;
};

// Base class PaintCost
class PaintCost {
   public:
      int getCost(int area) {
         return area * 70;
      }
};

// Derived class
class Rectangle: public Shape, public PaintCost {
   public:
      int getArea() {
         return (wIDth * height); 
      }
};

int main(voID) {
   Rectangle Rect;
   int area;

   Rect.setWIDth(5);
   Rect.setHeight(7);

   area = Rect.getArea();

   // Print the area of the object.
   cout << "Total area: " << Rect.getArea() << endl;

   // Print the total cost of painting
   cout << "Total paint cost: $" << Rect.getCost(area) << endl;

   return 0;
}