C++实现输入小数四舍五入与上下取整个数统计

```cpp #include <iostream> #include <cmath> int main() { int n; std::cin >> n; int upCount = 0, downCount = 0; for (int i = 0; i < n; ++i) { double num; std::cin >> num; // 四舍五入 int rounded = static_cast<int>(std::round(num)); // 向上取整 int up = static_cast<int>(std::ceil(num)); // 向下取整 int down = static_cast<int>(std::floor(num)); if (rounded == up) { upCount++; } if (rounded == down) { downCount++; } } std::cout << upCount << " " << downCount << std::endl; return 0; } ``` ######[AI问答 | 228点数解答 | 2026-05-17 13:25:34]