实现数据结构中的队列的删除插入和查询！很好用的,推荐给大家用-Data structure to realize the queue to the deletion of insertion and query!

用循环单链表实现队列的基本操作,很好的展现了队列的优点-Circulation singly linked list is used to implement the basic operations of a queue, good shows the advantages of the queue