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I am trying to calculate the average quizzes, tests and total score. I am getting a segmentation fault once I press n (for no). When I press n, it is supposed to show the averages for all of the scores I entered up to that point, like so:

Quiz1 Quiz2 midterm Final Total
Average 7.5 8.5 83.5 91 86.3

If anyone can help me ASAP, it would be greatly appreciated. Thank you.

#include
#include
#include
#define NAME_LEN 50

int read_line(char str[], int n);
void insert (int num_students);
void average_finder(int num_students);
void print (int num_students);

struct test_result {
char name[NAME_LEN+1];
int number;
int grade1;
int grade2;
int midterm;
int final;
float numeric;
struct test_result *next;
};

struct test_result *studen = NULL;

int main(void)
{

struct test_result *p;

char code = ‘y’;
int num_students = 0;
int done = 0;

while(!done) {
switch (code) {
case ‘y’: insert(num_students);
print(num_students);

break;
case ‘n’: average_finder(num_students); done++;
return 0;

default: printf(”Invalid entry. Try again.\n”);
return 0;
}

printf(”\nWould you like to enter another record? y(yes) or n(no)?”);
scanf(” %c”, &code);

while (getchar() != ‘\n’); /* skips to end of line */
}

return 0;
}

void insert(int num_students)
{

struct test_result *p;

p = malloc(sizeof(struct test_result));

printf(”Enter the student name: “);
read_line(p->name, NAME_LEN);

printf(”Enter the student’s grade for quiz #1: “);
scanf(”%d”, &p->grade1);

printf(”Enter the student’s grade for quiz #2: “);
scanf(”%d”, &p->grade2);

printf(”Enter the student’s grade for midterm: “);
scanf(”%d”, &p->midterm);

printf(”Enter the student’s grade for final: “);
scanf(”%d”, &p->final);

p->numeric = (((p->grade1 + p->grade2) * 1.25) + (p->midterm * 0.25) + (p->final * 0.50));

}

void average_finder(int num_students)
{

num_students = 0;

struct test_result *p;

int total_quiz1 = 0;
int total_quiz2 = 0;
int total_midterm = 0;
int total_final = 0;
int total_numeric = 0;
float average_quiz1 = 0;
float average_quiz2 = 0;
float average_midterm = 0;
float average_final = 0;
float average_numeric = 0;

total_quiz1 += p->grade1;
total_quiz2 += p->grade2;
total_midterm += p->midterm;
total_final += p->final;
total_numeric += p->numeric;

average_quiz1 = total_quiz1 / num_students;
average_quiz2 = total_quiz2 / num_students;
average_midterm = total_midterm / num_students;
average_final = total_final / num_students;
average_numeric = total_numeric / num_students;

printf(” Quiz1 Quiz2 Midterm Final Total\n”);
printf(”Average %9.1f %9.1f %9.1f %9.1f %9.3f\n”, average_quiz1, average_quiz2, average_midterm, average_final, average_numeric);

}

void print(int num_students)
{
struct test_result *p;

printf(”\n”);

printf(”Name Quiz1 Quiz2 Midterm Final Total\n”);
printf(”%10s %9d %9d %9d %9d %9.1f\n”, p->name, p->grade1, p->grade2, p->midterm, p->final, p->numeric);
}

int read_line(char str[], int n)
{
int ch, i = 0;

while(isspace(ch = getchar()))
;
str[i++] = ch;
while ((ch = getchar()) != ‘\n’) {
if (i < n)
str[i++] = ch;
}
str[i] = '\0';
return i;
}