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

typedef struct node_t{
  int x;
  struct node_t *next;
} node_t;

node_t *list_create(int x,node_t *next) {
  node_t *new_node = (node_t *)malloc(sizeof(node_t));
  if (new_node == NULL) {
		return (node_t*)1;
  }
  new_node->x=x;
  new_node->next=next;
  return new_node;
}

void list_append(node_t *head,int x) {
  node_t *cursor = head;
  while (cursor->next != NULL) {
    cursor=cursor->next;
  }
  cursor->next=list_create(x,NULL);
  return;
}

void list_destroy(node_t *head) {
  node_t *cursor = head->next, *temp = NULL;
  free(head);
  if (cursor != NULL) {
    while (cursor->next != NULL) {
      temp=cursor->next;
      free(cursor);
      cursor=temp;
    }
    free(cursor);
  }
  return;
}

int main() {
	node_t *head = list_create(0,NULL), *cursor = NULL;
	for (int i=1;i<32;i++) {
		list_append(head,i);
	}
	cursor=head;
	if (cursor->next == NULL) printf("%d",cursor->x);
	while (cursor->next != NULL) {
		printf("%d\n",cursor->x);
		cursor=cursor->next;
	}
	printf("%d\n",cursor->x);
	list_destroy(head);
}