What is a constant expression
Dave Jones
djones at megatest.UUCP
Sat Oct 21 08:40:41 AEST 1989
>From article <1219 at crdos1.crd.ge.COM>, by davidsen at crdos1.crd.ge.COM (Wm E Davidsen Jr):
>
...
> Background: large program, defines ASCII control characters with a
> macro as follows:
> #define CNTL(c) ('c' & 037)
> While this work fine with pcc, the ANSI preprocessor doesn't expand it.
How about
#define CNTL(c) ((c) & 037)
Then change all occurances of the form
CNTL(x)
into
CNTL('x')
(Use an AWK program to automate things, if there's a bunch of them.)
Ain't that the "right" way to do it?
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