//This program uses nested if/else statements to assign a 
//letter grade (A, B, C, D, or F) to a 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";
	cout << "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 
			{
				cout << "Your grade is F.\n";
			}
		}
	}
	return 0;
}