new_code( )

操作结果：构造空链表，若成功就初始化每个人的相关信息

delete_code( )

初始条件：线性链表存在

操作结果：释放指向出列的人的结点，并重新报数

-new_code () : List structure space, If successful on each of the initialization information delete_code () initial conditions : There linear chain operating results : the release pointing out out of the nodes, and re-reported number