题解 | #判断成绩等级#

#include <iostream>
using namespace std;

int main() {

    int score;
    cin >> score;

    // write your code here......

    cout << (score < 0    || score > 100 ? "成绩不合法": 
            (score <= 100 && score >= 90 ? "优秀": 
            (score <= 89  && score >= 80 ? "良": 
            (score <= 79  && score >= 70 ? "中": 
            (score <= 69  && score >= 60 ? "及格":"差")))));

    return 0;
}