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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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