Preprocessor: how to define a macro in terms of another

[recvfrom]

Hi!

I have a need to define a macro to be the larger (integer comparison)
of two other
macros, already defined in system header files. Is this possible??
Thanks!!!

-r

[A. Sinan Unur]

"recvfrom" <re******@gmail.com> wrote in news:1142816650.901465.228160
@z34g2000cwc.googlegroups.com:

I have a need to define a macro to be the larger (integer comparison)
of two other macros, already defined in system header files. Is this
possible??

I would have tried the obvious before asking:

#include <stdio.h>

#define VAL1 10
#define VAL2 20

#if VAL1 > VAL2
#define VAL_MAX VAL1
#else
#define VAL_MAX VAL2
#endif

int main(void) {
printf("%d\n", VAL_MAX);
return 0;
}

/* EOF */

D:\Home\asu1\UseNet\clc> gcc -Wall -W t.c -o t.exe -ansi -pedantic

D:\Home\asu1\UseNet\clc> t
20

I am assuming this is standards compliant, and hope someone will correct
me if it isn't.

Sinan
--
A. Sinan Unur <1u**@llenroc.ude.invalid>
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