Is it possible in C to compare a macro with a text value, like this:
#if MACRO == val
code;
#endif
I have attempted doing this but it hasn't worked so far. Is this at all possible, and if not, what is a good alternative?
Asked
Active
Viewed 38 times
0
-
It's possible if `MACRO` and `val` are integers. Not strings, though. – Steve Summit Sep 24 '22 at 17:05
-
No, the preprocessor can only do integer arithmetic. – Nate Eldredge Sep 24 '22 at 17:05
-
2You can do `#define RED 1` and `#define GREEN 2` and `#define BLUE 3`, and then do something like `#define color RED`, and finally do things like `#if color == BLUE`. – Steve Summit Sep 24 '22 at 17:06
-
Ok that's what I thought – nexos Sep 24 '22 at 17:47
-
@SteveSummit: Re “It's possible if `MACRO` and `val` are integers”: So if `val` is an integer, as in `int val;`, that means it is possible. – Eric Postpischil Sep 24 '22 at 17:49
-
@EricPostpischil If you say so. :-) (But I take your point.) – Steve Summit Sep 24 '22 at 17:56