> From owner-freebsd-questi...@freebsd.org Sun Oct 16 16:27:46 2011 > Date: Sun, 16 Oct 2011 14:26:31 -0700 > From: Gary Kline <kl...@thought.org> > To: FreeBSD Mailing List <freebsd-questions@freebsd.org> > Cc: > Subject: need to check for hex in C: how/ > > > if n == 15 and x is the int. i can say > > if ((int)x == 15) Or to check if x == 'A' i can cast x to (char)x. > > what's the syntax to chec if x is , say, 32/
The advice from my computer-science professor was 'try it and find out'. It doesn't matter what anybody _says_ it is, the only thing that matters is what the computer (or, to be precise, the compiler) accepts? Now, for some information that you could/should get from any elementary book on C programming ("The C Programming Language", by Kerningan and Ritchie [r.i.p., this last week] is recommended): In general, you don't need _any_ explicit casts for those situations. C does 'automatic' promotion of numeric items so they have comparable 'width' for comparisons. For more details, see the 'fine manual' mentioned above. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"