不要喊叫(不要只使用大写字母)！太粗鲁了！
阅读此内容: http://en.wikipedia.org/wiki/C_preprocessor [

Don''t shout (don''t use only capital letters)! It is rude!
Read this: http://en.wikipedia.org/wiki/C_preprocessor[^]

http://gcc.gnu.org/onlinedocs/cpp/Macros.html [ http://***.com/questions/1358232/why-use-macros-in-c [ ^ ]

http://gcc.gnu.org/onlinedocs/cpp/Macros.html[^]
http://***.com/questions/1358232/why-use-macros-in-c[^]

宏是C 编译器甚至看不到的东西.

根据 quick-Google-search (宏-C预处理器 [ ^ ]):

A macro is something the C compiler not even sees.

According to the first entry in a quick-Google-search (Macros - The C Preprocessor[^]):

也就是说:

• 宏是C 预处理器的东西.
• 使用Google，您可能会找到很多有关的文档.



That is:

• macros are C preprocessor stuff.
• Using Google you may find a lot of documentation about.

#define BUFSIZE  100
//...
int buf[BUFSIZE];
//...
if (k>BUFSIZE)
{
  //...
}

预处理器用数字100替换每次出现的宏BUFSIZE，因此 C编译器解析(类似)以下源:

the preprocessor replaces every occurrence of the macro BUFSIZE with the number 100, thus the C compiler parses (something like) the following source:

//...
int buf[100];
//...
if (k>100)
{
  //...
}