> I notice in most of the sample code, every global variable and
> function/procedure is declared extern. I'm not used to coding like this,
> and thus far I have NOT been declaring my code segments extern. Is this ok,
> or will it break in future OSs? What is extern really doing in the sample
> code? It seems unnecessary for a single segment program.
the "extern" keyword is primarially being used to tell the
compiler that a function or variable is defined somewhere
else in the source code (ie, another file that may not be
included in the current file context).
most of the time, if you forget to declare it extern, the
compiler will complain and say "what is this?" - mainly because
you have not defined it anywhere.
if all your code is in one file, you wont need the
"extern" declarations.. but doing so (one large file) is
normally considered "bad practice" (hope i dont step on
some toes here).. seperate files enforce some form of
modularity.
cheers.
az.
--
Aaron Ardiri
Lecturer http://www.hig.se/~ardiri/
University-College i G�vle mailto:[EMAIL PROTECTED]
SE 801 76 G�vle SWEDEN
Tel: +46 26 64 87 38 Fax: +46 26 64 87 88
Mob: +46 70 656 1143 A/H: +46 26 10 16 11
