电话簿管理程序。存储的数据包括：人名、工作单位、电话号码和E-mail地址等。程序具有如下功能：

①加入一个新电话号码；

②删除一个电话号码；

③显示保存的所有电话号码。

④修改功能；

⑤排序功能，包括按照电话号码排序和按照姓名字母序排列；

⑥查询功能，包括按人名查询电话号码和按电话号码查询人名。

-Phone book management. Stored data includes: name, company, phone number and E-mail address. Program has the following features: ① to add a new telephone number　② delete a phone number　③ show all the phone numbers stored. ④ modify function　⑤ sorting features, including sorting and in accordance with the telephone number listed in alphabetical order by name　⑥ query functions, including query by name phone number and name by telephone number search.