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