用循环链表建立的简单的汽车销售管理系统。可以输入、删除、排序记录，读取、保存文件。-Established with a simple circular list of car sales management system. You can enter /delete/sort records, read/save files.

航空售票系统，链表结构保存信息，实现 订购，查询，排序功能-Air ticketing systems, the list structure to save information to achieve order, query, sorting function