简单通讯录管理程序，可以实现对通讯录的一些较为简略的处理。如：增加一些记录（add），对已有的记录进行删除（del），显示通讯录中所有的记录（showall），按姓名查找并显示一条记录（query），以及按姓名修改一条记录（modify），并可从正文文件中添加数据到库表中（addfromtxtfile）以及将库表中的数据导出到正文文件（writetotxtfile），还可对库表进行几种不同的排序（sort），退出系统并做内部结尾工作（quit），并可在程序启动时加载已有数据，在用户退出系统时将现有记录保存等功能。-Simple address book management program, you can achieve some relatively simple processing to your address book. Such as: increasing the number of records (add), delete (del) of existing records, display the address book record (showall) to find and display a record (query), and modify a record by name (modify by name ), and can add data from a text file to the database table (addfromtxtfile) and export the data in the database table to text file (writetotxtfile), several different sorting (sort of) is also on the library table, exit the system and do the internal end of the work (quit), and can be loaded when the program starts existing data when the user exits the system, the existing record-keeping functions.