C语言书写的图书馆管理系统，运用了B树索引，大概就是这样-Written in C language library management system, using a B-tree index, this is probably

用C语言编写的图书馆管理系统，能够实现简单的图书添加，查询，删除的功能-Using C language library management system, enabling simple books to add, query, delete function