制作一个简易的通讯录，包括基本操作和存储功能。

用〈〈数据结构〉〉中的双向链表作数据结构，结合C语言基本知识。编写一个通讯录管理系统。以把所学数据结构知识应用到实际软件开发中去。

设计内容：本系统应完成一下几方面的功能：

输入信息——enter() 显示信息———display( )

查找以姓名作为关键字 ———search( ) [由一人完成]

删除信息———delete( ) 存盘———save ( ) 装入———load( )

任务：

每条信息至包含 ：姓名（NAME ）街道（STREET）城市（CITY）邮编（EIP）国家（STATE）几项

-Create a simple address book, including basic operation and storage. Use < < data structure> >　in the doubly linked list for data structure, combined with basic knowledge of C language. Write a contact management system. Data structure to the knowledge learned into practice to software development. Design content: The system should be completed a few simple features: input- enter ()　display information--- display ()　search by name as a keyword--- search ()　[completed by one person] to delete information--- delete ()　Save--- save ()　loading--- load ()　task: each piece of information to include: Name (NAME) streets (STREET) City (CITY) Zip code (EIP) countries ( STATE) several