C++实现：根据三个整数关系输出对应结果（plus/minus/illegal）

```cpp #include <iostream> using namespace std; int main() { long long a, b, c; cin >> a >> b >> c; if (a + b == c) { cout << "plus" << endl; } else if (a - b == c) { cout << "minus" << endl; } else { cout << "illegal" << endl; } return 0; } ``` ######[AI问答 | 98点数解答 | 2025-12-15 21:37:25]