#include <iostream.h>

void main (void) {

	int classes = -1;
	char input;
	float total = 0;
	bool fGrade = false;

	do {
		cout << "\nPlease enter letter grade number " << classes+2 << " or a non-grade to exit --> ";
		cin >> input;
		switch (input) {
		case 'A':case 'a': total += 4; break;
		case 'B':case 'b': total += 3; break;
		case 'C':case 'c': total += 2; break;
		case 'D':case 'd': total += 1; break;
		case 'F':case 'f': fGrade = true; break;
		}
		classes++;
	} while (input == 'A' || input == 'B' || input == 'C' || input == 'D' || input == 'F' || input == 'a' || input == 'b' || input == 'c' || input == 'd' || input == 'f');

	total = total / float(classes);	
	cout << "\n\nGPA = " << total;

	if (classes < 4) cout << "\nIneligible, taking less than 4 classes."; else
	if (total < 2.0 && fGrade) cout << "\nIneligible, gpa below 2.0 and has F grade"; else
	if (total < 2.0) cout << "\nIneligible, gpa below 2.0"; else
	if (fGrade) cout << "\nIneligible, gpa above 2.0 but has F grade"; else
		cout << "\nEligible";
	cout << "\n\n\n";

}