所谓“文件”是指一组相关数据的有序集合。 这个数据集有一个名称，叫做文件名。 实际上在前面的各章中我们已经多次使用了文件，例如源程序文件、目标文件、可执行文件、库文件 (头文件)等。文件通常是驻留在外部介质(如磁盘等)上的， 在使用时才调入内存中来。从不同的角度可对文件作不同的分类。从用户的角度看，文件可分为普通文件和设备文件两种。-The so-called "file" refers to the orderly collection of a group of related data. This data set has a name, called the file name. In fact, in the previous chapters, we have repeatedly used documents, such as source files, object files, executable files, library files (header files). File usually resides in the external media (such as disk) into memory only when in use. From a different perspective on the file to a different classification. From the perspective of the user, the file can be divided into two kinds of ordinary files and device files.