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| From | James Kuyper <jameskuyper@verizon.net> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: c99 and the lack of warnings when int operations are applied to a bool |
| Date | 2012-04-26 21:58 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <jncuh1$ls$1@dont-email.me> (permalink) |
| References | (1 earlier) <jkinde$or2$1@speranza.aioe.org> <jksrbo$p2a$1@dont-email.me> <jnbd7q$17a$1@dont-email.me> <jnbhej$ovn$1@dont-email.me> <jncspr$on8$1@dont-email.me> |
On 04/26/2012 09:29 PM, Eric Sosman wrote:
...
> "I'll grant that there are other ways to write the logic," as
> a person I deeply respect once wrote.
>
> Here's another example where arithmetic on bool is handy:
>
> const int days_in_month[2][12] = {
> { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
> { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
> };
> bool is_leap_year = ...;
> int month = ...;
> int days = days_in_month[is_leap_year][month - 1];
>
> "One (int) cast and all's well," but don't forget the skeptical
> glance one usually casts upon casts...
In a hypothetical C-like language where bools were truly a separate
type, a cast to int would not be allowed. Instead, use
(isleap_year ? 1 : 0).
--
James Kuyper
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c99 and the lack of warnings when int operations are applied to a bool mathog <dmathog@gmail.com> - 2012-03-23 08:40 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-03-23 12:07 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool jacob navia <jacob@spamsink.net> - 2012-03-23 21:45 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Robert Wessel <robertwessel2@yahoo.com> - 2012-03-23 17:17 -0500
Re: c99 and the lack of warnings when int operations are applied to a bool jacob navia <jacob@spamsink.net> - 2012-03-23 23:29 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Ian Collins <ian-news@hotmail.com> - 2012-03-24 11:48 +1300
Re: c99 and the lack of warnings when int operations are applied to a bool jacob navia <jacob@spamsink.net> - 2012-03-24 23:47 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Willem <willem@toad.stack.nl> - 2012-03-25 09:05 +0000
Re: c99 and the lack of warnings when int operations are applied to a bool "BartC" <bc@freeuk.com> - 2012-03-25 11:30 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-25 21:05 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Lowell Gilbert <lgusenet@be-well.ilk.org> - 2012-03-25 16:15 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-25 22:14 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-03-25 23:46 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-26 12:05 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Lowell Gilbert <lgusenet@be-well.ilk.org> - 2012-03-26 15:22 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Gareth Owen <gwowen@gmail.com> - 2012-03-25 11:44 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-25 13:06 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-27 11:12 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool Robert Wessel <robertwessel2@yahoo.com> - 2012-03-24 01:15 -0500
Re: c99 and the lack of warnings when int operations are applied to a bool jacob navia <jacob@spamsink.net> - 2012-03-24 23:29 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool mathog <dmathog@gmail.com> - 2012-03-27 09:53 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool Keith Thompson <kst-u@mib.org> - 2012-03-27 11:07 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-03-27 14:16 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-26 07:57 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool jacob navia <jacob@spamsink.net> - 2012-04-26 14:08 +0200
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-04-26 09:09 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-26 21:29 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-04-26 21:58 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-26 22:32 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-04-27 06:31 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Lanarcam <lanarcam1@yahoo.fr> - 2012-04-27 19:26 +0200
Re: c99 and the lack of warnings when int operations are applied to a bool Keith Thompson <kst-u@mib.org> - 2012-04-27 11:28 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool Lanarcam <lanarcam1@yahoo.fr> - 2012-04-27 20:51 +0200
Re: c99 and the lack of warnings when int operations are applied to a bool ImpalerCore <jadill33@gmail.com> - 2012-04-27 12:17 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool Jens Gustedt <jens.gustedt@loria.fr> - 2012-04-28 09:17 +0200
Re: c99 and the lack of warnings when int operations are applied to a bool Keith Thompson <kst-u@mib.org> - 2012-04-28 13:26 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool Willem <willem@toad.stack.nl> - 2012-04-27 18:11 +0000
Re: c99 and the lack of warnings when int operations are applied to a bool ImpalerCore <jadill33@gmail.com> - 2012-04-27 12:05 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-04-27 15:32 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Willem <willem@toad.stack.nl> - 2012-04-27 20:16 +0000
Re: c99 and the lack of warnings when int operations are applied to a bool James Kuyper <jameskuyper@verizon.net> - 2012-04-27 16:45 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Rui Maciel <rui.maciel@gmail.com> - 2012-04-27 21:26 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-27 21:18 -0400
Re: c99 and the lack of warnings when int operations are applied to a bool Rui Maciel <rui.maciel@gmail.com> - 2012-04-27 21:33 +0100
Re: c99 and the lack of warnings when int operations are applied to a bool Keith Thompson <kst-u@mib.org> - 2012-04-27 15:36 -0700
Re: c99 and the lack of warnings when int operations are applied to a bool ImpalerCore <jadill33@gmail.com> - 2012-04-27 08:31 -0700
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