问题描述
我记得我的一位教授在C语言入门课程中提出了一个要求。他表示， #define 预处理程序命令使程序员能够创建一个常量以供以后的代码使用，并且该命令是C语言的组成部分。
I recall a claim made by one of my professors in an introductory C course. He stated that the #define preprocessor command enables a programmer to create a constant for use in later code, and that the command was a part of the C language.
/* Is this truly C code? */
#define FOO 42
由于这是入门编程班，我怀疑他只是简化了源文件和编译器之间的关系，但是尽管如此，我还是想验证一下我的理解。
Since this was in an introductory programming class, I suspect that he was merely simplifying the relationship between the source file and the compiler, but nevertheless I wish to verify my understanding.
预处理器语句是否完全独立于C语言（取决于（使用的特定编译器上）还是在 C99标准中明确描述了它们？出于好奇，K& R是否曾经提到预处理器宏？
Are preprocessor statements completely independent from the C language (dependent on the specific compiler used) or are they explicitly described in the C99 standard? Out of curiosity, did K&R ever mention preprocessor macros?
推荐答案
是的，该标准描述了预处理器。这是C语言的标准组成部分。
Yes, the standard describes the preprocessor. It's a standardized part of the C language.
请注意， #include 对于代码的模块化至关重要，是预处理程序指令。
Note that #include, which is essential for modularization of code, is a preprocessor directive.
在，该预处理器在6.10节中进行了描述。
In the publically-available draft of the C99 standard, the preprocessor is described in section 6.10.
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