/*

Program file: 	snowhp5.c
Author: 		Harmonie Snow
Date: 			November 6, 2022
Assignment: 	Program #5
Objective: 		This program calculates and prints out a grade report for a class. It has been modified to include functions.

*/

#include <stdio.h>

/*define prototypes*/

int get_num_stud(void);
int get_num_grds(void);
int calc_average(int, int);
int get_sum(int, int);
int calc_class_average(int, int);

int main(void) /*added int as return type to as C-Free was giving an error "return type defaults to 'int'"" since none was present*/
{

	int grade;
	int num_grades, num_stud;
	int max_grades = 10;
	int x, y;
	int sum = 0;
	int average[100] = {0}, class_average = 0;

	char c, class_name[20];
	char name[100][25];

	printf("\nThis program will find the average of up to %i grades "
		   "for students.\n",
		   max_grades);

	printf("\nPlease Enter the Class Name: ");
	scanf("%19[^\n]s", class_name);
	while ((c = getchar() != '\n') && c != EOF)
		;

	do
	{
		num_stud = get_num_stud(); /*function #1 inserted - gets number of students to enter*/

		if (num_stud < 2 || num_stud > 100)
			printf("\nInvalid number of students, enter 2 - 100.\n\n");

	} while (num_stud < 2 || num_stud > 100);

	do
	{
		num_grades = get_num_grds(); /*function #2 inserted - gets number of grades to enter*/

		if (num_grades < 2 || num_grades > max_grades)
			printf("\nInvalid number of grades, try again.\n\n");

	} while (num_grades < 2 || num_grades > max_grades);

	printf("\nNow enter the %i grades to be averaged.\n\n", num_grades);

	for (y = 0; y < num_stud; y++)
	{
		printf("Enter name for student #%i: ", y + 1);
		scanf("%24[^\n]s", name[y]);
		while ((c = getchar() != '\n') && c != EOF)
			;

		for (x = 0; x < num_grades; x++)
		{
			do
			{
				printf("Enter grade #%i for %s: ", x + 1, name[y]);
				scanf("%i", &grade);
				while ((c = getchar() != '\n') && c != EOF)
					;

				if (grade < 0 || grade > 100)
					printf("*** Invalid entry. Grade must be 0 to 100.\n");

			} while (grade < 0 || grade > 100);

			sum = get_sum(sum, grade); /*function #3 inserted - does the math to provide the sum and returns it*/
		}

		printf("\n");
		average[y] = calc_average(sum, num_grades); /*function #4 inserted - computes a student's average*/
		sum = 0;
	}

	printf("\n\n          The %s Grades Report\n\n", class_name);
	printf(" Student                  Average     Grade \n\n");

	for (x = 0; x < num_stud; x++)
	{
		printf("%-25s   %3i        ", name[x], average[x]);
		sum = sum + average[x];

		if (average[x] < 64)
			printf("F");
		else if (average[x] < 67)
			printf("D");
		else if (average[x] < 70)
			printf("D+");
		else if (average[x] < 74)
			printf("C-");
		else if (average[x] < 77)
			printf("C");
		else if (average[x] < 80)
			printf("C+");
		else if (average[x] < 84)
			printf("B-");
		else if (average[x] < 87)
			printf("B");
		else if (average[x] < 90)
			printf("B+");
		else if (average[x] < 94)
			printf("A-");
		else
			printf("A");

		printf("\n");
	}

	class_average = calc_class_average(sum, num_stud); /*function #5 added - takes sum and the number of students, returns the class average*/

	printf("\n\nThe average of the %i grades entered for %i students in %s"
		   " is %i \n\n",
		   num_grades, num_stud, class_name, class_average);

	getchar();

	return 0;
} /*end main*/

/*begin functions*/

int get_num_stud(void)
{
	int num_st;
	char c;

	printf("\nEnter the number of students to process: ");
	scanf("%i", &num_st);
	while ((c = getchar() != '\n') && c != EOF)
		;

	return num_st;

} /*end get_num_stud*/

int get_num_grds(void)
{
	int grd_st;
	char c;

	printf("\nEnter the number of grades to process: ");
	scanf("%i", &grd_st);
	while ((c = getchar() != '\n') && c != EOF)
		;

	return grd_st;

} /*end get_num_grds*/

int get_sum(sum, grade)
{
	sum = sum + grade;

	return sum;

} /*end get_sum*/

int calc_average(sum, num_grades)
{
	int av;

	av = sum / num_grades;

	return av;

} /*end calc_average*/

int calc_class_average(sum, num_stud)
{
	int class_av;

	class_av = (float)sum / num_stud + .5;

	return class_av;

} /*end calc_class_average*/