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/* File : example.h */
#include <stdio.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;
static int get_nshapes();
};
class Circle : public Shape {
private:
double radius;
public:
Circle(double r) : radius(r) { };
~Circle() { };
void set_radius( double r );
virtual double area(void);
virtual double perimeter(void);
};
class Square : public Shape {
private:
double width;
public:
Square(double w) : width(w) { };
~Square() { }
virtual double area(void);
virtual double perimeter(void);
};
Circle *CircleFactory( double r );
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