为什么只有90分，root ? ? ?

#include #include using namespace std; int main() { int a,b; char c; cin >> a >> b >> c; if (c == '+') {cout << a + b;} else if (c == '-') {cout << a - b;} else if (c == '*') {cout << a * b;} else if (c == '/') {cout <<a/b;} else if (b == 0) {cout << "Divided by zero!";} else cout << "Invalid operator!"; return 0; }