图书借阅管理的设计与实现系统设计，包括内存数据结构设计、数据文件设计、代码设计、输入/输出设计、用户界面设计、处理过程设计。要求内存数据用链表组织，数据文件用文本文件，用户界面用字符界面，枚举量用枚举类型表示。至少实现数据记录的增加、修改、删除、查询及相应结果的显示，查询应能按不同数据项进行。-Book Lending Management Design and Implementation of system design, including memory data structure design, data document design, code design, input/output design, user interface design, process design. Asked to use linked list memory data organization, data files using a text file, the user interface with the character interface to enumerate the amount indicated with the enumerated type. Achieving at least the increase in data record, edit, delete, query and corresponding results are displayed, the query should be able to different data items.