12
void move(double dx, double dy);
13
virtual double area(void) = 0;
14
virtual double perimeter(void) = 0;
16
static int get_nshapes();
19
class Circle : public Shape {
23
Circle(double r) : radius(r) { }
25
void set_radius( double r );
26
virtual double area(void);
27
virtual double perimeter(void);
30
class Square : public Shape {
34
Square(double w) : width(w) { }
36
virtual double area(void);
37
virtual double perimeter(void);