我们知道C语言的功能非常强大， 很适合编写系统软件。利用它我们可以很容易地解决经常遇到的一些棘手的问题，如拷贝隐含或系统属性的文件（特别是光盘中的隐含文件）、在任意DOS版本或在windows中更改子目录的名称、在任意DOS 版本中使用带空格的目录名等等。 这些问题仅靠操作系统或常用的工具软件往往很难凑效。我们可以利用Ｃ语言的强大功能来编写一些小程序，能够很顺利地解决这些问题。 -We know C language is very powerful, very suitable for the preparation of system software. Use it, we can easily solve the often encountered a number of difficult issues, such as copies of the implied or system file attributes (especially the CD-ROM implied document), in any version of DOS or in windows change the name of a subdirectory , in the arbitrary use of DOS version of the directory name with spaces and so on. These problems alone operating system or commonly used software tools together is often difficult to effect. We can use the C language the power to write some small programs that can successfully solve these problems.