#include <stdio.h>
#include <math.h>

int main()
{

	char q;
	int classes = 0;
	int i = 0;
	int units = 0;
	double unitsTotal = 0.0;
	double gradeTotal = 0.0;
	double gpa = 0.0;

	printf("Enter how many classes you have taken: ");
	scanf_s("%d", classes);
	printf("Enter your grades for each class and how many units each is worth.");

	while (i <= classes) {

		printf("Enter grade for course %d: ", i);
		q = getchar();
		if (q = 'a' || 'A')
		{
			printf("How many units for this course?");
			scanf_s("%d", units);
			unitsTotal = unitsTotal + units;
			gradeTotal = gradeTotal + (units * 4);
			i = i + 1;
		}
		else if (q = 'b' || 'B')
		{
			printf("How many units for this course?");
			scanf_s("%d", units);
			unitsTotal = unitsTotal + units;
			gradeTotal = gradeTotal + (units * 3);
			i = i + 1;
		}
		else if (q = 'c' || 'C')
		{
			printf("How many units for this course?");
			scanf_s("%d", units);
			unitsTotal = unitsTotal + units;
			gradeTotal = gradeTotal + (units * 2);
			i = i + 1;
		}
		else if (q = 'd' || 'D')
		{
			printf("How many units for this course?");
			scanf_s("%d", units);
			unitsTotal = unitsTotal + units;
			gradeTotal = gradeTotal + (units * 2);
			i = i + 1;
		}
		else if (q = 'f' || 'F')
		{
			printf("How many units for this course?");
			scanf_s("%d", units);
			unitsTotal = unitsTotal + units;
			gradeTotal = gradeTotal + (units * 0);
			i = i + 1;
		}
		else
		{
			printf("invalid grade.");
		}
	}
	gpa = gradeTotal / unitsTotal;
	printf("your gpa is %.2f", gpa);
}