值得注意的是,我们把自己的头文件称作头文件,而对于系统环境提供的头文件,我们却把它们称作标准头,而不是标准头文件,这样做的原因是:在所有的c++系统环境中,头都是真正的文件,然而我们却没有必要让系统头做文件.尽管我们能用#include指令访问头文件和系统头,但我们还是没有必要以同样的方式来实现它们."[/u]-It is worth noting that we treat our own header file called the header files, and system environment for the provision of the first document, but they referred to as the standard of our head, instead of the standard header files, the reasons for doing so is: Of all the C2B !+ system environment, the first of the documents are genuine, but we do not have the necessary documents to allow the system to do first. While we can be# include instructions to visit the first header files and system, but we did not need to come to the same manner to achieve them.　[/ u]