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

struct Node{  //alias 
    int a;
    struct Node* next;
};

void createNode(){
    struct Node* n=(struct Node *)malloc(sizeof(struct Node));
    n->a=10;
    n->next=NULL;
}

int main(){
   struct Node* head;
   printf("%p\n",head.next);
   createNode();
   createNode();
   printf("%d\n",n->a);
   printf("%p",n->next);
    
    return 0;
}