一个面试c程序

帮忙看看......电脑重装系统了....收集的资料也.....写过的代码也....珍藏的东西也..........没了 - -!!!
node_t * ChangeTwoNodes(node_t *list)
{
    if( list )
   {
       for(node_t* pre=0,*ord=list,*post=list->next;
           post; pre=ord,ord=ord->next,post=ord->next)
      {
                 ord->next = post->next;
                 post->next = ord;
                 pre==0?list=post:pre->next = post;
       }
       return list;
     }
     else return 0;
}
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难道没有区别么？

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