output linked list to txt file - c

Question

Hello I am trying to export a linked list to a text file but somehow all the time the text file reaches to very big size(5gb)and not opened.
I would be happy if you could see what the problem is and offer me a way to repair her thanks
My code -
#include <stdio.h>
#include <stdlib.h>
typedef struct node
{
int data;
struct node *next;
} node;
node* insert(node* head, int num);
void free_list(node *head);
void fprintfList(node *head);
int main()
{
int num;
int temp;
node *head, *p;
head = NULL;
FILE * MyFile;
do
{
printf("Enter numbers\n");
scanf("%d",&num);
if(num)
{
head = insert(head, num);
}
} while(num);
p = head;
MyFile = fopen("New_File.txt","w");
while(head)
{
fprintf(MyFile, "%d\n",head->next);
}
//fprintfList(head);
free_list(head);
fclose(MyFile);
return 0;
}
node* insert(node* head, int num)
{
node *temp, *prev, *next;
temp = (node*)malloc(sizeof(node));
temp->data = num;
temp->next = NULL;
if(!head){
head=temp;
} else{
prev = NULL;
next = head;
while(next && next->data<=num){
prev = next;
next = next->next;
}
if(!next){
prev->next = temp;
} else{
if(prev) {
temp->next = prev->next;
prev-> next = temp;
} else {
temp->next = head;
head = temp;
}
}
}
return head;
}
void free_list(node *head)
{
node *prev = head;
node *cur = head;
while(cur)
{
prev = cur;
cur = prev->next;
free(prev);
}
}

Answer 1

while(head)
{
fprintf(MyFile, "%d\n",head->next);
}
Your problem lies here. You loop until head is NULL, but never actually change the head pointer, hence you'll just loop forever writing the same data out until you run out of disk space. In addition, you're printing the value of the next pointer, not actually the data stored in the node.
You first need print the actual data, so change the fprintf to:
fprintf(MyFile, "%d\n",head->data);
Secondly, you actually need to iterate over the list, like follows
while(head)
{
fprintf(MyFile, "%d\n",head->data);
head = head->next;
}