A macro is something the
not even sees.
According to the first entry in a quick-Google-search
(Macros - The C Preprocessor
A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro.
- macros are
C preprocessor stuff.
- Using Google you may find a lot of documentation about.
In any case here you are a simple (silly, there are spectacular - and cryptic - usages of macros) example:
#define BUFSIZE 100
the preprocessor replaces every occurrence of the macro
with the number
, thus the
compiler parses (something like) the following source: