#include <iostream>

using namespace std;


int main()

{
	int option;
	int score = 105;
	double gpa;
	do {
		cout << "Menu:\n"
			<< "1. Enter your testscore \n"
			<< "2. Enter your GPA to see if you made the deans list \n"
			<< "3. Exit\n"
			<< "Enter an option by entering 1, 2, or 3: ";

		cin >> option;
		cout << endl;


		switch (option)
		{
		case 1:
			cout << " You chose option one" << endl;
			cout << "Enter your test score" << endl;
			cin >> score;
			while (cin.fail()) // check for input error
			{
				if (cin.eof())
				{
					// Once EOF file has been reached with cin,
					// you can't do much. Figure out a way to bail
					// from the loop.
				}

				cin.clear();

				// Also, ignore not just one character but till the end of the line.
				// cin.ignore();
				cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

				cout << "You entered an incorrect value. Please enter an integer 0-100" << endl;
				cin >> score;
			}

			if (score >= 90 && score <= 100) {
				cout << "The grade is an A" << endl;
			}
			else if (score >= 80 && score < 90) {
				cout << "The grade is a B" << endl;
			}
			else if (score >= 70 && score < 80) {
				cout << "The grade is a c" << endl;
			}
			else if (score >= 60 && score < 70) {
				cout << "The grade is a D" << endl;
			}
			else if (score >= 0 && score < 60) {
				cout << "The grade is a F" << endl;
			}

			else {
				cout << "Your score is out of range" << endl;
			}
			break;

		case 2:
			cout << "You chose option two\n";
			cout << "Enter your GPA" << endl;
			cin >> gpa;
			while (cin.fail()) // check for input error
			{
				if (cin.eof())
				{
					// Once EOF file has been reached with cin,
					// you can't do much. Figure out a way to bail
					// from the loop.
				}

				cin.clear();

				// Also, ignore not just one character but till the end of the line.
				// cin.ignore();
				cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

				cout << "You entered an incorrect value. Please enter a value between 0-4" << endl;
				cin >> gpa;
			}
			if (gpa >= 3.9 && gpa <= 4.0) {

				cout << "You're on the deans list." << endl;
			}
			else if (gpa >= 0 && gpa < 3.8) {
				cout << "You're not elligible for the deans list." << endl;
			}
			else {
				cout << "Your gpa is out of range" << endl;
			}
			break;

		case 3:
			cout << "You chose to exit, thank you.\n";
			break;

		default:
			cout << "Invalid option, please enter 1, 2, or 3.\n";
		}


	}

	while (option != 3);

	return 0;
}