#include <iostream>

using namespace std;

int main()

{
	// Declare variables
	double score;
	char grade = ' ';

	cout << "Please enter a test score: ";
	cin >> score;

	if (score <= 100 && score >= 0)
		if (score >= 70)
			if (score >= 77)
				if (score >= 87)
					if (score >= 94 && score <= 100)
						grade = 'A';       
					else
						grade = 'B';
				else
			        grade = 'C';
			else
				grade = 'D';
		else
			grade = 'F';
	else
        cout << "Grade must be between 0 and 100!\n"; 
	
	if (grade != ' ')
		cout << "Your test score was a " << grade << "!" << endl;
	return 0;
}