进行文件基本操作的应用程序。本实例的知识点有：调用C++现成的系统函数库进行文件的各种操作（查找、检查操作权限、重命名、删除）。-Basic operations for file applications. The examples of knowledge points are: calling C++ library for existing file systems of various operations (find, check operation permissions, rename, delete).