图书管理\book.txt
........\card.txt
........\card1.txt
........\people.txt
........\people1.txt
........\reader.txt
........\t.txt
........\Untitled1.cpp
........\Untitled2.cpp
........\Untitled2.exe
........\主函数.cpp
........\主函数.exe
........\新建 文本文档.txt
........\未命名1.exe
图书管理