| /* File : example.h */ |
| |
| class Shape { |
| public: |
| Shape(); |
| virtual ~Shape(); |
| double x, y; |
| void move(double dx, double dy); |
| virtual double area() const = 0; |
| virtual double perimeter() const = 0; |
| static int nshapes; |
| }; |
| |
| class Circle : public Shape { |
| private: |
| double radius; |
| public: |
| Circle(double r) : radius(r) { }; |
| virtual double area() const; |
| virtual double perimeter() const; |
| }; |
| |
| class Square : public Shape { |
| private: |
| double width; |
| public: |
| Square(double w) : width(w) { }; |
| virtual double area() const; |
| virtual double perimeter() const; |
| }; |
| |
| |
| |
| |
| |