C++：轻松求解输入两整数间 3 的倍数个数及它们的和

```cpp #include <iostream> using namespace std; int main() { int a, b; cin >> a >> b; if (a > b) { int temp = a; a = b; b = temp; } int count = 0; int sum = 0; for (int i = a; i <= b; i++) { if (i % 3 == 0) { count++; sum += i; } } cout << count << endl; cout << sum << endl; return 0; } ``` ######[AI问答 | 133点数解答 | 2025-11-23 15:28:53]