#include <iostream>

using namespace std;

char courseScore(int);

int main()
{
	int score;

	cout << "Line 1: Based on the course score, \n"
	<< " this program computes the "
	<< "course grade." << endl;

	cout << "Line 4: Enter course score: ";
	cin >> score;
	cout << endl << "Line 6: Course score is "
	<< score << endl;

	char grade = courseScore(score);

	cout << "Line 7: Your grade for the course is ";
	cout << grade;

	return 0;
}

char courseScore(int score)
{
	if (score >= 90)
		return 'A';
	else if (score >= 80)
		return 'B';
	else if (score >= 70)
		return 'C';
	else if (score >= 60)
		return 'D';
	else
		return 'F';
}