[백준] 9498번 : 시험 성적 - C++

https://www.acmicpc.net/problem/9498

#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;
    if(n>=90) cout << "A";
    else if(n>=80) cout << "B";
    else if(n>=70) cout << "C";
    else if(n>=60) cout << "D";
    else cout << "F";
}