I am getting the error message below when I try to make my source code file.
gcc -o grading.c -lm
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [grading] Error 1
the source code \/
insert
Code:
/*
********************************************************
***
***
*/
#include <stdio.h>
#include <stdlib.h>
int main ()
{ /* main */
/*
***************************
*** Declaration Section ***
***************************
*
*****************************
* Named Constant Subsection *
*****************************
*
* A_grade the minimum grade a student needs to get an A.
* B_grade the minimum grade a student needs to get a B.
* C_grade the minimum grade a student needs to get a C.
* D_grade the minimum grade a student needs to get a D.
* F_grade the minimum grade a student needs to get an F.
* initial_sum initial sum that various things are set to.
* max_pos_scr the max score possible in the class.
* spring value used to represent the spring semester.
* fall value used to represent the fall semester.
* program_failure_code used to exit the program due to idiotproofing.
* quiz_one_points the max points available for quiz one.
* quiz_two_points the max points available for quiz two.
* quiz3_points the max points available for quiz three.
* quiz_four_points the max points available for quiz four.
* pp1_points the maximum number of points available for pp1
* pp2_points the maximum number of points available for pp2
* pp3_points the maximum number of points available for pp3
* lab_points the max pts available for labs.
* final_exam_points the max pts available for the final exam.
* first_student number representing the 1st value in an array
*/
const float A_grade = 4500;
const float B_grade = 4000;
const float C_grade = 3500;
const float D_grade = 3000;
const float F_grade = 0;
const float initial_sum = 0;
const float max_pos_scr = 5000.0;
const int spring = 1;
const int fall = 2;
const int program_failure_code = -1;
const int quiz_one_points = 30;
const int quiz_two_points = 170;
const int quiz3_points = 130;
const int quiz_four_points = 115;
const int pp1_points = 250;
const int pp2_points = 1000;
const int pp3_points = 2000;
const int lab_points = 505;
const int final_exam_points = 800;
const int first_student = 0;
const int zero = 0;
const int one = 1;
/*
*****************************
* Local Variable Subsection *
*****************************
*
* quiz_one_score array that holds the scores for quiz one.
* quiz_two_score array that holds the scores for quiz two.
* quiz3_score array that holds the scores for quiz three
* quiz_four_score array that holds the scores for quiz four.
* pp1_score an array that holds the scores for pp1.
* pp2_score an array that holds the scores for pp2.
* pp3_score an array that holds the scores for pp3.
* lab_score array holding the lab scores
* fnl_exm_scr array holding the final exam scores
* overall_score array holding the overall scores
* stdt_prcntg_scr_score array holding overall percentage scores
* student_ID an array that holds the student ID's.
* student_letter_grade array holding student letter grades.
* overall_score_sum sum of the overall scores of all students.
* overall_score_mean mean of the overall scores of all students
* quiz_one_score_sum sum of the quiz one scores of all students
* quiz_one_score_mean mean quiz one scores of all students.
* quiz_two_score_sum sum of the quiz two scores
* quiz_two_score_mean mean quiz two scores
* quiz3_score_sum sum of the quiz three scores
* quiz3_score_mean mean quiz three scores
* quiz_four_score_sum sum of quiz four scores.
* quiz_four_score_mean mean quiz four scores of all students.
* pp1_score_sum sum of the pp1 scores of all students.
* pp1_score_mean mean of the pp1 scores of all students.
* pp2_score_sum sum of the pp2 scores of all students.
* pp2_score_mean mean of the pp2 scores of all students.
* pp3_score_sum sum of the pp3 scores of all students.
* pp3_score_mean mean of the pp3 scores of all students.
* lab_score_sum sum of the lab scores of all students.
* lab_score_mean mean of the lab scores of all students.
* fnl_exm_scr_sum sum of final exam scores of all students.
* fnl_exm_scr_mean mean final exam scores of all students.
* quiz1_lowest_score the lowest quiz one score.
* quiz2_lowest_score the lowest quiz two score.
* quiz3_lowest_score the lowest quiz three score.
* quiz4_lowest_score the lowest quiz four score.
* pp1_lowest_score the lowest pp1 score.
* pp2_lowest_score the lowest pp2 score.
* pp3_lowest_score the lowest pp3 score.
* lab_lowest_score the lowest lab score.
* final_exam_lowest_score the lowest final exam score.
* quiz1_highest_score the highest quiz one score.
* quiz2_highest_score the highest quiz two score.
* quiz3_highest_score the highest quiz three score.
* quiz4_highest_score the highest quiz four score.
* pp1_highest_score the highest pp1 score.
* pp2_highest_score the highest pp2 score.
* pp3_highest_score the highest pp3 score.
* lab_highest_score the highest lab score.
* final_exam_highest_score the highest final exam score.
* stdt_prcntg_scr_sum sum of overall percentage scores.
* stdt_prcntg_scr_mean mean overall percentage scores.
* low_overall_percentage_score the lowest overall percentage score.
* high_overall_percentage_score the highest overall percentage score.
* year reps the year the student was enrolled.
* semester reps the fall or spring semester.
* num_students num students enrolled in the class.
* student reps the position in an array of students.
* num_As num who received an A in the class.
* num_Bs num who received a B in the class.
* num_Cs num who received a C in the class.
* num_Ds num who received a D in the class.
* num_Fs num who received an F in the class.
*
*/
float* quiz_one_score = (float*)NULL;
float* quiz_two_score = (float*)NULL;
float* quiz3_score = (float*)NULL;
float* quiz_four_score = (float*)NULL;
float* pp1_score = (float*)NULL;
float* pp2_score = (float*)NULL;
float* pp3_score = (float*)NULL;
float* lab_score = (float*)NULL;
float* fnl_exm_scr = (float*)NULL;
float* overall_score = (float*)NULL;
float* stdt_prcntg_scr = (float*)NULL;
int* student_ID = (int*)NULL;
char* student_letter_grade = (char*)NULL;
float overall_score_sum;
float overall_score_mean;
float quiz_one_score_sum;
float quiz_one_score_mean;
float quiz_two_score_sum;
float quiz_two_score_mean;
float quiz3_score_sum;
float quiz3_score_mean;
float quiz_four_score_sum;
float quiz_four_score_mean;
float pp1_score_sum;
float pp1_score_mean;
float pp2_score_sum;
float pp2_score_mean;
float pp3_score_sum;
float pp3_score_mean;
float pp4_score_sum;
float pp4_score_mean;
float lab_score_sum;
float lab_score_mean;
float fnl_exm_scr_sum;
float fnl_exm_scr_mean;
float quiz1_lowest_score;
float quiz2_lowest_score;
float quiz3_lowest_score;
float quiz4_lowest_score;
float pp1_lowest_score;
float pp2_lowest_score;
float pp3_lowest_score;
float lab_lowest_score;
float final_exam_lowest_score;
float quiz1_highest_score;
float quiz2_highest_score;
float quiz3_highest_score;
float quiz4_highest_score;
float pp1_highest_score;
float pp2_highest_score;
float pp3_highest_score;
float lab_highest_score;
float final_exam_highest_score;
float stdt_prcntg_scr_sum;
float stdt_prcntg_scr_mean;
float low_overall_percentage_score;
float high_overall_percentage_score;
int year;
int semester;
int num_students;
int student;
int num_As;
int num_Bs;
int num_Cs;
int num_Ds;
int num_Fs;
/*
*************************
*** Execution Section ***
*************************
*
/*
************************
*** Input Subsection ***
************************
*
*/
/*
* Input the year and semester (1 for spring, 2 for fall).
*/
scanf("%d %d", &year, &semester);
/*
* Idiot-proof the input for the year and semester.
*/
if (year < zero) {
/*
* Output the error message and exit
*/
printf("ERROR: unknown year and semester code %d.\n", semester);
exit(program_failure_code);
}
/*
* Input the number of students enrolled in the class.
*/
scanf("%d", &num_students);
/*
* Idiot-proof the input for the number of students enrolled.
*/
if (num_students < one) {
/*
* Output the error message and exit
*/
printf("ERROR: unknown num students code %d.\n", num_students);
exit(program_failure_code);
}
/*
* Allocate and Idiotproof each array.
*/
student_ID = (int*)malloc(sizeof(int)*num_students);
if (student_ID == (int*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" student ID failed.\n");
exit(program_failure_code);
} /* if (student_ID == (int*)NULL */
quiz_one_score = (float*)malloc(sizeof(float)*num_students);
if (quiz_one_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" quiz one score failed.\n");
exit(program_failure_code);
} /* if (quiz_one_score == (float*)NULL */
quiz_two_score = (float*)malloc(sizeof(float)*num_students);
if (quiz_two_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" quiz two score failed.\n");
exit(program_failure_code);
} /* if (quiz_two_score == (float*)NULL */
quiz3_score = (float*)malloc(sizeof(float)*num_students);
if (quiz3_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" quiz three score failed.\n");
exit(program_failure_code);
} /* if (quiz3_score == (float*)NULL */
quiz_four_score = (float*)malloc(sizeof(float)*num_students);
if (quiz_four_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" quiz four score failed.\n");
exit(program_failure_code);
} /* if (quiz_four_score == (float*)NULL */
pp1_score = (float*)malloc(sizeof(float)*num_students);
if (pp1_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" pp1 score failed.\n");
exit(program_failure_code);
} /* if (pp1_score == (float*)NULL */
pp2_score = (float*)malloc(sizeof(float)*num_students);
if (pp2_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" pp2 score failed.\n");
exit(program_failure_code);
} /* if (pp2_score == (float*)NULL */
pp3_score = (float*)malloc(sizeof(float)*num_students);
if (quiz_one_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" pp3 score failed.\n");
exit(program_failure_code);
} /* if (pp3_score == (float*)NULL */
lab_score_score = (float*)malloc(sizeof(float)*num_students);
if (lab_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" lab score failed.\n");
exit(program_failure_code);
} /* if (lab_score == (float*)NULL */
fnl_exm_scr_score = (float*)malloc(sizeof(float)*num_students);
if (fnl_exm_scr_score == (float*)NULL {
printf("ERROR: the attempt to allocate\n");
printf(" final exam score failed.\n");
exit(program_failure_code);
} /* if (fnl_exm_scr_score == (float*)NULL */
student_letter_grade = (char*)malloc(sizeof(char)*num_students);
if (student_letter_grade == (char*)NULL) {
printf("ERROR: the attempt to allocate\n");
printf(" the student's letter grade failed.\n");
exit(program_failure_code);
} /* if (student_letter_grade == (char*)NULL) */
stdt_prcntg_scr = (float*)malloc(sizeof(float)*num_students);
if (stdt_prcntg_scr == (float*)NULL) {
printf("ERROR: the attempt to allocate\n");
printf(" the student's overall percentage score failed.\n");
exit(program_failure_code);
} /* if (stdt_prcntg_scr == (float*)NULL) */
/*
* make a for loop that will read all the information for each student
*/
for (student = first_student; student < num_students; student++) {
/*
* Input each of the elements from the database into each array.
*/
scanf("%d %f %f %f %f %f %f %f %f %f",
&student_ID[student],
&quiz_one_score[student], &quiz_two_score[student],
&quiz3_score[student], &quiz_four_score[student],
&pp1_score[student], &pp2_score[student], &pp3_score[student],
&lab_score[student], &fnl_exm_scr[student]);
printf("Done inputting data for student #%d:\n", student);
printf("student_ID[%d]: %f\n", student, student_ID[student]);
printf("quiz_one_score[%d]: %f\n", student, quiz_one_score[student]);
printf("quiz_two_score[%d]: %f\n", student, quiz_two_score[student]);
printf("quiz3_score[%d]: %f\n", student, quiz3_score[student]);
printf("quiz_four_score[%d]: %f\n", student, quiz_four_score[student]);
printf("pp1_score[%d]: %f\n", student, pp1_score[student]);
printf("pp2_score[%d]: %f\n", student, pp2_score[student]);
printf("pp3_score[%d]: %f\n", student, pp3_score[student]);
printf("fnl_exm_scr[%d]: %f\n", student, fnl_exm_scr[student]);
} /* for student */
/* insert idiotproofing here */
/*
******************************
*** Calculation Subsection ***
******************************
*/
/* Calculate each students overall score, overall percentage
*score for the semester and their letter grade*/
for (student = first_student; student<num_students; student++) {
overall_score[student] = quiz_one_score[student]
+ quiz_two_score[student]
+ quiz3_score[student] + quiz_four_score[student]
+ pp1_score[student] +
pp2_score[student] + pp3_score[student]
+ lab_score[student] + fnl_exm_scr[student];
stdt_prcntg_scr[student] = overall_score[student]/max_pos_scr;
if (overall_score >= A_grade) {
student_letter_grade[student] = A;
} /* if (overall_score >= A_grade) */
else if (overall_score >= B_grade) {
student_letter_grade[student] = B;
} /* if (overall_score >= B_grade) */
else if (overall_score >= C_grade) {
student_letter_grade[student] = C;
} /* if (overall_score >= C_grade) */
else if (overall_score >= D_grade) {
student_letter_grade[student] = D;
} /* if (overall_score >= D_grade) */
else if (overall_score >= F_grade) {
student_letter_grade[student] = F;
} /* if (overall_score >= F_grade) */
}
/* calculate the score means by first adding up all the scores*/
overall_score_sum = initial_sum;
quiz_one_score_sum = initial_sum;
quiz_two_score_sum = initial_sum;
quiz3_score_sum = initial_sum;
quiz_four_score_sum = initial_sum;
pp1_score_sum = initial_sum;
pp2_score_sum = initial_sum;
pp3_score_sum = initial_sum;
lab_score_sum = initial_sum;
fnl_exm_scr_sum = initial_sum;
for (student = first_student; student < num_students; student++) {
/* calculate the sum of the overall scores */
overall_score_sum += overall_score[student];
/* calculate the sum of the mean scores for quiz one */
quiz_one_score_sum += quiz_one_score[student];
/* calculate the sum of the mean scores for quiz two */
quiz_two_score_sum += quiz_two_score[student];
/* calculate the sum of the mean scores for quiz three */
quiz3_score_sum += quiz3_score[student];
/* calculate the sum of the mean scores for quiz four */
quiz_four_score_sum += quiz_four_score[student];
/* calculate the sum of the mean scores for pp1 */
pp1_score_sum += pp1_score[student];
/* calculate the sum of the mean scores for pp2 */
pp2_score_sum += pp2_score[student];
/* calculate the sum of the mean scores for pp3 */
pp3_score_sum += pp3_score[student];
/* calculate the sum of the mean scores for the labs */
lab_score_sum += lab_score[student];
/* calculate the sum of the mean scores for the final exams */
fnl_exm_scr_sum += fnl_exm_scr[student];
}
/* calculate the mean score for all the students overall. */
overall_score_mean = overall_score_sum/num_students;
/* calculate the mean score for quiz one. */
quiz_one_score_mean = quiz_one_score_sum/num_students;
/* calculate the mean score for quiz two. */
quiz_two_score_mean = quiz_two_score_sum/num_students;
/* calculate the mean score for quiz three. */
quiz3_score_mean = quiz3_score_sum/num_students;
/* calculate the mean score for quiz four. */
quiz_four_score_mean = quiz_four_score_sum/num_students;
/* calculate the mean score for pp1. */
pp1_score_mean = pp1_score_sum/num_students;
/* calculate the mean score for pp2. */
pp2_score_mean = pp2_score_sum/num_students;
/* calculate the mean score for pp3. */
pp3_score_mean = pp3_score_sum/num_students;
/* calculate the mean score for lab. */
lab_score_mean = lab_score_sum/num_students;
/* calculate the mean score for the final exam. */
fnl_exm_scr_mean = fnl_exm_scr_sum/num_students;
/*
* Calculate the lowest quiz one score score of all the students.
*/
quiz1_lowest_score = quiz_one_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz_one_score[student] < quiz1_lowest_score) {
quiz1_lowest_score = quiz_one_score[student];
} /* if (quiz_one_score[student] < quiz1_lowest_score) */
} /* for student */
/*
* Calculate the lowest quiz two score score of all the students.
*/
quiz2_lowest_score = quiz_two_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz_two_score[student] < quiz2_lowest_score) {
quiz2_lowest_score = quiz_two_score[student];
} /* if (quiz_two_score[student] < quiz2_lowest_score) */
} /* for student */
/*
* Calculate the lowest quiz three score score of all the students.
*/
quiz3_lowest_score = quiz3_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz3_score[student] < quiz3_lowest_score) {
quiz3_lowest_score = quiz3_score[student];
} /* if (quiz3_score[student] < quiz3_lowest_score) */
} /* for student */
/*
* Calculate the lowest pp1 score score of all the students.
*/
pp1_lowest_score = pp1_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp1_score[student] < pp1_lowest_score) {
pp1_lowest_score = pp1_score[student];
} /* if (pp1_score[student] < pp1_lowest_score) */
} /* for student */
/*
* Calculate the lowest pp2 score score of all the students.
*/
pp2_lowest_score = pp2_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp2_score[student] < pp2_lowest_score) {
pp2_lowest_score = pp2_score[student];
} /* if (pp2_score[student] < pp2_lowest_score) */
} /* for student */
/*
* Calculate the lowest pp3 score score of all the students.
*/
pp3_lowest_score = pp3_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp3_score[student] < pp3_lowest_score) {
pp3_lowest_score = pp3_score[student];
} /* if (pp3_score[student] < pp3_lowest_score) */
} /* for student */
/*
* Calculate the lowest lab score score of all the students.
*/
lab_lowest_score = quiz_one_score[first_student];
for (student = first_student; student < num_students; student++) {
if (lab_score[student] < lab_lowest_score) {
lab_score = lab_score[student];
} /* if (lab_score[student] < lab_score) */
} /* for student */
/*
* Calculate the lowest final exam score score of all the students.
*/
fnl_exm_scr = fnl_exm_scr[first_student];
for (student = first_student; student < num_students; student++) {
if (fnl_exm_scr[student] < final_exam_lowest_score) {
final_exam_lowest_score = fnl_exm_scr[student];
} /* if (fnl_exm_scr[student] < final_exam_lowest_score) */
} /* for student */
/*
* Calculate the highest quiz one score score of all the students.
*/
quiz1_highest_score = quiz_one_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz_one_score[student] > quiz1_highest_score) {
quiz1_highest_score = quiz_one_score[student];
} /* if (quiz_one_score[student] > quiz1_highest_score) */
} /* for student */
quiz2_highest_score = quiz_two_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz_two_score[student] > quiz2_highest_score) {
quiz2_highest_score = quiz_two_score[student];
} /* if (quiz_two_score[student] > quiz2_highest_score) */
} /* for student */
quiz3_highest_score = quiz3_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz3_score[student] > quiz3_highest_score) {
quiz3_highest_score = quiz3_score[student];
} /* if (quiz3_score[student] > quiz3_highest_score) */
} /* for student */
quiz4_highest_score = quiz_four_score[first_student];
for (student = first_student; student < num_students; student++) {
if (quiz_four_score[student] > quiz4_highest_score) {
quiz4_highest_score = quiz_four_score[student];
} /* if (quiz_four_score[student] > quiz4_highest_score) */
} /* for student */
pp1_highest_score = pp1_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp1_score[student] > pp1_highest_score) {
pp1_highest_score = pp1_score[student];
} /* if (pp1_score[student] > pp1_highest_score) */
} /* for student */
pp2_highest_score = pp2_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp2_score[student] > pp2_highest_score) {
pp2_highest_score = pp2_score[student];
} /* if (pp2_score[student] > pp2_highest_score) */
} /* for student */
pp3_highest_score = pp3_score[first_student];
for (student = first_student; student < num_students; student++) {
if (pp3_score[student] > pp3_highest_score) {
pp3_highest_score = pp3_score[student];
} /* if (pp3_score[student] > pp3_highest_score) */
} /* for student */
lab_highest_score = lab_score[first_student];
for (student = first_student; student < num_students; student++) {
if (lab_score[student] > lab_highest_score) {
lab_highest_score = lab_score[student];
} /* if (lab_score[student] > lab_highest_score) */
} /* for student */
final_exam_highest_score = fnl_exm_scr[first_student];
for (student = first_student; student < num_students; student++) {
if (fnl_exm_scr[student] > final_exam_highest_score) {
final_exam_highest_score = fnl_exm_scr[student];
} /* if (fnl_exm_scr[student] > final_exam_highest_score) */
} /* for student */
/*
* Calculate the number of students who received an A.
*/
for (student = first_student; student < num_students; student++) {
if (overall_score[student] >= A_grade) {
num_As++;
} /* if (overall_score[student] >= A_grade) */
} /* for student */
/*
* Calculate the number of students who received a B.
*/
for (student = first_student; student < num_students; student++) {
if (overall_score[student] >= B_grade) {
num_Bs++;
} /* if (overall_score[student] >= B_grade) */
} /* for student */
/*
* Calculate the number of students who received a C.
*/
for (student = first_student; student < num_students; student++) {
if (overall_score[student] >= C_grade) {
num_Cs++;
} /* if (overall_score[student] >= C_grade) */
} /* for student */
/*
* Calculate the number of students who received a D.
*/
for (student = first_student; student < num_students; student++) {
if (overall_score[student] >= D_grade) {
num_Ds++;
} /* if (overall_score[student] >= D_grade) */
} /* for student */
/*
* Calculate the number of students who received an F.
*/
for (student = first_student; student < num_students; student++) {
if (overall_score[student] >= F_grade) {
num_Fs++;
} /* if (overall_score[student] >= F_grade) */
} /* for student */
/*
* Calculate the mean overall percentage score of all students in the course
*/
for (student = first_student; student<num_students; student++) {
stdt_prcntg_scr_sum += stdt_prcntg_scr[student];
} /* for student */
stdt_prcntg_scr_mean = stdt_prcntg_scr_sum/num_students;
/*
* Calculate lowest overall percentage score of students in the course.
*/
low_overall_percentage_score = stdt_prcntg_scr[first_student];
for (student = first_student; student < num_students; student++) {
if (stdt_prcntg_scr[student] < low_overall_percentage_score) {
low_overall_percentage_score = stdt_prcntg_scr[student];
} /* if (stdt_prcntg_scr[student] < low_overall_percentage_score) */
} /* for student */
/*
* Calculate highest overall percentage score of students in the course.
*/
high_overall_percentage_score = stdt_prcntg_scr[first_student];
for (student = first_student; student < num_students; student++) {
if (stdt_prcntg_scr[student] > high_overall_percentage_score) {
high_overall_percentage_score = stdt_prcntg_scr[student];
} /* if (stdt_prcntg_scr[student] > high_overall_percentage_score) */
} /* for student */
/*
*************************
*** Output Subsection ***
*************************
*/
/*
* output the name of the course, the semester, the year, in that order
* output the number of students.
* output each of the items that were calculated,
* in the same order as the calculation subsection
*/
free(fnl_exm_scr);
fnl_exm_scr = (float*)NULL;
free(lab_score);
lab_score = (float*)NULL;
free(pp3_score);
pp3_score = (float*)NULL;
free(pp2_score);
pp2_score = (float*)NULL;
free(pp1_score);
pp1_score = (float*)NULL;
free(quiz_four_score);
quiz_four_score = (float*)NULL;
free(quiz3_score);
quiz3_score = (float*)NULL;
free(quiz_two_score);
quiz_two_score = (float*)NULL;
free(quiz_one_score);
quiz_one_score = (float*)NULL;
free(student_ID);
student_ID = (int*)NULL;
} /* main */