#include "stdio.h"

 #include "stdlib.h"

 struct list_head{

     struct list_head *prev;

     struct list_head *next;

 };

 struct task{

     int member;

     struct list_head list;

 };

 #define list_entry(ptr,member,type) \

 ((type*)((char *)ptr-(unsigned long)&(((type*))->member)))

 #define Init_list(list) {&list,&list}

  static  void list_add(struct list_head* ptr,struct list_head* n){

     ptr->next=n->next;

     n->next->prev=ptr;

     n->next=ptr;

     ptr->prev=n;

 }

 #define for_each(list_)\

 for(pos=list_.next;pos!=&list_;pos=pos->next)\

 {printf("%d ",list_entry(pos,list,struct task)->member);}\

 printf("\n");

 void main(){

     struct task* tmp;

     int i;

     struct list_head mylist=Init_list(mylist),*pos;

     for( i=;i<;i++){

         tmp=(struct task*)malloc(sizeof(struct task));

         scanf("%d",&(tmp->member));

         list_add(&(tmp->list),&mylist);

     }

     for_each(mylist);

 }