Conditional Compile Question

**nobbyv** · 12-05-2005

Just a quick basic question for a C newb:

If I use some preprocessor conditional compile directives, can I declare the same variable to be two different values? For example, I want an array to have 7 elements if one #ifdef is true, and 9 elements if another #ifdef is true, with each containing different values. If the arrays are initialized within the #ifdefs, is this legal, or will I get some sort of "Redefinition" error with my compiler (it's Keil C51 if that matters)?

Thanks!

**quzah** · 12-05-2005

Code:

#ifdef FOO
#define BAR 7
#else
#define BAR 9
#endif
int array[BAR];

Yeah, it's fine. You could also move the declaration of the array in there also. But in either case, for looping and what not, you'll want to do the '#define BAR X' so all of your loops can be:

Code:

for( x = 0; x < BAR; x++ )

Quzah.

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