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

int main (int argc, char **argv) {
  
  struct List {
    int elem;
    struct List *next;
  };
  
  struct List *list, *tmp;

  list = NULL;

  tmp = malloc (sizeof (struct List));
  if (!tmp) {
    fprintf (stderr, "%s: Out of memory!\n", argv[0]);
    exit (1);
  }

  tmp->elem = 4;
  tmp->next = NULL;

  list = tmp;

  tmp = malloc (sizeof (struct List));
  if (!tmp) {
    fprintf (stderr, "%s: Out of memory!\n", argv[0]);
    exit (1);
  }

  tmp->elem = 5;
  tmp->next = NULL;
  
  list->next = tmp;

  tmp = list;
  
  while (tmp) {
    printf ("The next list element is %d\n", tmp->elem);
    tmp = tmp->next;
  }
  return 0;

}