说明：  用单向链表实现通讯录的自动初始化数据，自动添加，手动添加，查找，删除等功能，也可以此为基础改为图书馆管理系统，采用C语言编写，dos下执行
(With a one-way list to achieve the address book automatically initialize the data, automatically add, manually add, find, delete and other functions can also be based on this library management system)