题解 | #判断成绩等级#

#include <iostream>
using namespace std;

int main() {
    
    int score;
    cin >> score;

    string level;
    level = score>100?"成绩不合法":
                score>=90?"优秀":
                   score>=80?"良":
                        score>=70?"中":
                            score>=60?"及格":
                                score>=0?"差": 
                                    "成绩不合法";
    
    cout<<level;
    return 0;
}