题解 | #判断成绩等级#

#include <iostream>
using namespace std;

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

    if (score >= 90)
    {
        if(score <= 100)
            cout << "优秀";
        else
            cout << "成绩不合法";
    }    
    else if (score >= 80)
        cout << "良";
    else if (score >= 70)
        cout << "中";
    else if (score >= 60)
        cout << "及格";
    else
    {
        if (score >= 0)
            cout << "差";
        else
            cout << "成绩不合法";
    }
        
    

    return 0;
}