//This program uses an if/else statement to assign a 
//letter grade (A,B, C,D, or F)  numeric test score.
#include <iostream>
using namespace std;

int main()
{
	//Constants for grade tresholds
	const int A_SCORE = 90,
			  B_SCORE = 80,
			  C_SCORE = 70,
			  D_SCORE = 60;
			  
	int testScore;		//To hold a numeric test score
	
	//Get the numeric test score.
	cout << "Enter your numeric test score and I will\n"
		 << "tell you the letter grade you earned: ";
	cin >> testScore;
	
	//Determine the letter grade.
	if (testScore >= A_SCORE)
		cout << "Your grade is A.\n";
	else if (testScore >= B_SCORE)
		cout << "Your grade is B.\n";
	else if (testScore >= C_SCORE)
		cout << "Your grade is C.\n";
	else if (testScore >= D_SCORE)
		cout << "Your grade is D.\n";
	else 
		cout << "Your grade is F.\n";
		
	return 0;
}