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Ah thank you very much; it's working perfectly now.

#include <stdio.h>
#include <stdlib.h>

struct nodePayload{
int number;
};

struct node{
struct nodePayload *payload;
struct node *next;

temp->payload = malloc(sizeof(struct nodePayload));
I'm very new to c. I tried adding this before the first malloc, but I don't know what I'm doing. Can you spell it out for me?

What should I have done?

Also it crashes on its third running of S_ADD.

#include <stdio.h>
#include <stdlib.h>

struct nodePayload{
int number;
};

struct node{
struct nodePayload *payload;
struct node *next;