#include <iostream>
using namespace std;
char getGrade(int score) {
if (score >=80) return 'A';
if (score >=70) return 'B';
if (score >=60) return 'C';
if (score >=50) return 'D';
else return 'F';
}
int main(){
int score;
char grade;
cout <<"กรอกคะแนนนักเรียน:";
cin >> score;
grade = getGrade(score);
cout << "เกรด" << grade << endl;
return 0;
}
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