题解 | #判断成绩等级#

#include <iostream>
using namespace std;
string calculateGrade(int score) 
{
    if (score < 0 || score > 100)
    {
        return "成绩不合法";
    } else if (score >= 90 && score <= 100)
    {
        return "优秀";
    } else if (score >= 80 && score <= 89) 
    {
        return "良";
    } else if (score >= 70 && score <= 79) 
    {
        return "中";
    } else if (score >= 60 && score <= 69) 
    {
        return "及格";
    } else
    {
        return "差";
    }
}
int main() {

    int score;
    cin >> score;

    // write your code here......
     string grade = calculateGrade(score);
    
    cout << grade << endl;

    return 0;
}