题解 | 加减乘除
#include <bits/stdc++.h>
using namespace std;
int getFac(int x) {
int ans = 1;
while (x != 0) {
ans *= x;
x--;
}
return ans;
}
int main() {
int a, b;
char c;
while (cin >> a) {
cin >> c;
if (c == '!') {
cout << getFac(a)<<endl;
} else {
cin >> b;
if (c == '+')cout << a + b << endl;
else if (c == '-')cout << a - b << endl;
else if (c == '*')cout << a* b << endl;
else if (c == '/') {
if (b == 0)cout << "error" << endl;
else cout << a / b << endl;
} else if (c == '%') {
if (b == 0)cout << "error" << endl;
else cout << a % b << endl;
}
}
}
}
不等长获取，加上个条件判断即可
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