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