#include <iostream.h>
int getScore();
void findGrade( int, char&, char&);
void printGrade( int, char&, char&);


int main() {

	int score;
	char letterGrade, plusMinus;
   int sentinel;

	score = getScore();
	findGrade(score, letterGrade, plusMinus);
	printGrade(score, letterGrade, plusMinus);
   return 0;
}

int getScore()
{
	int numGrade;
	cout << "Please enter a score in the range 0-100: " << flush;
	cin >> numGrade;
	cout << endl;
	while ((numGrade < 0) || (numGrade > 100)) {
		cout << "You have entered an invalid score." << endl;
		cout << "Please enter a score in the range 0-100: " << flush;
		cin >> numGrade;
		cout << endl;
      }
   return numGrade;
}   // end getScore

void findGrade(int score, char &letterGrade, char &plusMinus)
{
	switch (score / 10)
   {
		case 9: case 10:
			letterGrade = 'A'; break;
		case 8:
			letterGrade = 'B'; break;
		case 7:
			letterGrade = 'C'; break;
		case 6:
			letterGrade = 'D'; break;
		default:
			letterGrade = 'F';
	}
	const char PLUS = '+';
	const char MINUS = '-';
	const char BLANK = ' ';
	if (score == 100)
		plusMinus = PLUS;
	else if (score < 60)
		plusMinus = BLANK;
	else
		switch (score % 10)
      {
			case 7: case 8: case 9:
				plusMinus = PLUS; break;
			case 0: case 1: case 2:
				plusMinus = MINUS; break;
			default:
				plusMinus = BLANK;
		}
} // end findGrade

void printGrade(int score, char &letterGrade, char &plusMinus)
{
	cout << "The assigned grade for the score " << score
		  << " is " << letterGrade << plusMinus << endl;
} // end printGrade