| 13 | import box; |
| 14 | |
| 15 | void testBox(const Box& box) |
| 16 | { |
| 17 | std::cout << "The box's volume is " << box.volume() << ".\n"; |
| 18 | if (box) |
| 19 | std::cout << "This volume is non-zero."; |
| 20 | if (!box) |
| 21 | std::cout << "This volume is zero."; |
| 22 | std::cout << std::endl; |
| 23 | } |
| 24 | |
| 25 | int main() |
| 26 | { |