C++抽象类

#include <iostream>

using namespace std;

// Base class
class Shape {
   public:
      // pure virtual function provIDing interface framework.
      virtual int getArea() = 0;
      voID setWIDth(int w) {
         wIDth = w;
      }

      voID setHeight(int h) {
         height = h;
      }

   protected:
      int wIDth;
      int height;
};

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

class Triangle: public Shape {
   public:
      int getArea() { 
         return (wIDth * height)/2; 
      }
};

int main(voID) {
   Rectangle Rect;
   Triangle  Tri;

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

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

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

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

   return 0;
}