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

typedef struct ListNode {
   int data;
   struct ListNode *next;
} ListNode;

int main() {
    printf("Hello, World! again...\n");

    ListNode *head;
    head = NULL;

    for (int i = 0; i < 5; i++) {
       ListNode *temp = (ListNode *)  malloc(sizeof(ListNode));
       (*temp).data = i; //same as temp->data = i;
       temp->next = head;

       head = temp;;
       
    }

    ListNode *p = head;
    while (p != NULL) {
       printf("data %d\n", p->data);
       p = p->next;
    }


    return 0;
}