🚀 go-pugleaf

In article <711@mtndew.Tustin.CA.US> friedl@mtndew.Tustin.CA.US (Stephen Friedl) writes:
>     Let's say that I've got an int whose legal range is 0 to 100,
>and I want to validate it (say) upon entry to a function.  Is this
>a portable way to do it?
>  foo(v) int v; {
>    if ( (unsigned int) vu > 100) printf("value out of range!\n");
>    /* must be valid */

It's portable because conversions from int to unsigned int are defined
and because MAX_UINT is sufficiently large for your purpose.

>     Note that I am not looking for the aesthetics of this -- it's
>a trick that will just confuse somebody

You bet!  After all, you print "value out of range!\n" and then fall
through to the next line, assuming "must be valid" :-)
--
Norman Diamond       diamond@jit081.enet.dec.com
If this were the company's opinion, I wouldn't be allowed to post it.
"Yeah -- bad wiring.  That was probably it.  Very bad."