structStudFull.c

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#define NUM_OF_LABS 1 //Make sure to change these back to 8 & 3
#define NUM_OF_EXAMS 1
#define labWeightScore .4f
#define examWeightScore .4f

typedef struct
{
	char fname[10];
	char lname[15];
	float perGrade;
	char letGrade;
}STUD;
typedef struct
{
	char fname[10];
	char lname[15];
	float perGrade;
	char letGrade;
}TEMP;

void calcPercent(float *);
void calcLetter(float, char *);
void calcExams(float *);
void calcLabs(float *);
void calcFinal(float *);
void enterStudents(STUD [], TEMP[]);
void sortByName(void);
void sortByGPA(STUD theClass[], int);
void writeToScreen();

main()
{
	STUD theClass[30];
	int scount = 0 ;
	int choice;

	printf("What would you like to do?\n");
	printf("1. Enter Students?\n");
	printf("2. Sort by name?\n");
	printf("3. Sort by GPA?\n");
	printf("0. Exit\n");
	scanf("%d",&choice);

	switch(choice)//choices
	{
		case 1:enterStudents(theClass, &scount);
			break;
		case 2:sortByName();
			break;
		case 3:sortByGPA(theClass);
			break;
		case 0:
			break;
		default:printf("Invalid input!\n\n");//default choice

	}

	
	return(0);
}
void calcPercent(float * ptr_perGrade)
{
	float labs = 0;
	float exams = 0;
	float final = 0;

	calcLabs(&labs);
	calcExams(&exams);
	calcFinal(&final);

	*ptr_perGrade = labs + exams + final; 
	fflush(stdin); //Extra fflush for getting rid of line return error.
}
void calcLabs(float * ptr_labs) //Calculate labs scores and averages.
{
	int labCnt = 0;
	float labScore = 0;
	float currentLab = 0;

	while (labCnt < NUM_OF_LABS)
		{
			labCnt++;
			printf("Enter score for lab %d: ", labCnt);
			scanf("%f", &currentLab);
			labScore = labScore + currentLab;
			
		}
	labScore = labScore / labCnt;
	*ptr_labs = labScore * .40f; //calculate weighted average.
}
void calcExams(float * ptr_exams)
{
	int examCnt = 0;
	float examScore = 0;
	float currentExam = 0;

	while (examCnt < NUM_OF_EXAMS)
		{
			examCnt++;
			printf("Enter score for exam %d: ", examCnt);
			scanf("%f", &currentExam);
			examScore += currentExam;
			
		}
	examScore = examScore / NUM_OF_EXAMS;
	*ptr_exams = examScore * examWeightScore; //calculate weighted average.
}
void calcFinal(float * ptr_final)
{
	float finalScore;

	printf("Enter score for Final exam: ");
	scanf("%f", &finalScore);
	*ptr_final = finalScore * .2f; //calculate weighted average.
}
void calcLetter(float * ptr_perGrade, char * ptr_letGrade) //Calculate Letter grade
{
	if (*ptr_perGrade >= 94 && *ptr_perGrade <= 100)
	{
		*ptr_letGrade = 'A';
	}
	else
		{
			if (*ptr_perGrade >= 85 && *ptr_perGrade <= 93)
			{
				*ptr_letGrade = 'B';
			}
			else 	
				{
					if (*ptr_perGrade >= 75 && *ptr_perGrade <= 84)
						{
							*ptr_letGrade = 'C';
						}
					else
						{	
							if (*ptr_perGrade > 65 && *ptr_perGrade <= 74)
								{
									*ptr_letGrade = 'D';
								}
							else
							{
								if (*ptr_perGrade < 65)
									{
										*ptr_letGrade = 'F';
									}
							}
					}
			}
	}
}
void enterStudents(STUD theClass[], int *ptr_scount )
{
	
		printf("\n Enter the last name or 0 to exit: ");
		scanf("%14[^\n]s", theClass[*ptr_scount].lname);
		fflush(stdin);

	while(theClass[*ptr_scount].lname[0]!='0')
	{
		printf("\n Enter the first name or 0 to exit: ");
		scanf("%9[^\n]s", theClass[*ptr_scount].fname);
		fflush(stdin);

		calcPercent(&theClass[*ptr_scount].perGrade);
		calcLetter(&theClass[*ptr_scount].perGrade,
					&theClass[*ptr_scount].letGrade);

		(*ptr_scount)++;
		printf("\n Enter the last name or 0 to exit: ");
		scanf("%14[^\n]s", theClass[*ptr_scount].lname);
		fflush(stdin);
	}
}
void sortByName()
{
	if ()
	{

	}
}
void sortByGPA(STUD theClass[])
{
	int i = 0;

		if(theClass[i].perGrade > theClass[i+1].perGrade )
		{
			TEMP = theClass[i];
			theClass[i] = theClass[i+1];
			theClass[i+1] = TEMP;
		}

}
void writeToScreen()
{

}