// number to grades //


#include <iostream>
#include <string>
using namespace std;

int grade_number; // grade number
int remainder_number; // remainer number
char grade_letter; // grade letter
char boundry_grade; // boundry for number if +/- or null
char final_grade; // final grade for students

int main ()
{
cout << "Enter student Grade:";
cin >> grade_number;
if (grade_number <= 60) // grade = 60 or less is an F
	grade_letter = 'F';
else
	if (grade_number <= 70) // grade = 70 or less is an D
		grade_letter = 'D';
else
	if (grade_number <= 80) // ditto with all the rest
		grade_letter = 'C';
else
	if (grade_number <= 90)
		grade_letter = 'B';
else
	if (grade_number <= 100)
		grade_letter = 'A';

remainder_number = grade_number % 10; // working out the remainder for the +/- of grade

if (remainder_number == 0) // if == 0 then + also as no remainder means its 10
		boundry_grade = '+';
else
		if (remainder_number <=3)
			boundry_grade = '-';
else
	if (remainder_number <=7)
		boundry_grade = ' ';
else
	if (remainder_number <=9) // if 8 or 9 then plus
		boundry_grade = '+';


final_grade = strcat(grade_letter , boundry_grade);

cout << "Your Mark is " << grade_number << " Your Grade is " << final_grade << '\n'; // calling out mark from input and grade letter :)
return (0);
}