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