| /* File : example.c */ |
| |
| #include "example.h" |
| #include <math.h> |
| #ifndef M_PI |
| # define M_PI 3.14159265358979323846 |
| #endif |
| |
| int Shape::get_nshapes() { |
| return nshapes; |
| } |
| |
| /* Move the shape to a new location */ |
| void Shape::move(double dx, double dy) { |
| x += dx; |
| y += dy; |
| } |
| |
| int Shape::nshapes = 0; |
| |
| void Circle::set_radius( double r ) { |
| radius = r; |
| } |
| |
| double Circle::area(void) { |
| return M_PI*radius*radius; |
| } |
| |
| double Circle::perimeter(void) { |
| return 2*M_PI*radius; |
| } |
| |
| double Square::area(void) { |
| return width*width; |
| } |
| |
| double Square::perimeter(void) { |
| return 4*width; |
| } |
| |
| Circle *CircleFactory( double r ) { |
| return new Circle(r); |
| } |