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Groups > comp.lang.c > #387488
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: how cast works? |
| Date | 2024-08-11 17:07 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <86frrak3hf.fsf@linuxsc.com> (permalink) |
| References | (7 earlier) <v93565$6ffo$1@dont-email.me> <v93h12$9vom$1@dont-email.me> <87frre8v5q.fsf@nosuchdomain.example.com> <v95fcj$pv2g$1@dont-email.me> <87ttft7bei.fsf@nosuchdomain.example.com> |
Keith Thompson <Keith.S.Thompson+u@gmail.com> writes: > David Brown <david.brown@hesbynett.no> writes: > >> On 09/08/2024 01:14, Keith Thompson wrote: >> >>> David Brown <david.brown@hesbynett.no> writes: >>> [...] >>> >>>> A _Bool is always either 0 or 1. The conversion is whatever the >>>> compiler needs to give an int of value 0 or 1. >>> >>> The value of a _Bool object is always either 0 or 1 *unless* the >>> program does something weird. >> >> True. But attempting to use a _Bool object (as a _Bool) that does not >> contain either 0 or 1 is going to be undefined behaviour (at least it >> was on the platform where I saw this happen as a code bug). > > It depends on whether representations with non-zero padding bits are > treated as trap representations (non-value representations in C23) or > not. In C99 and C11, iirc, the width of _Bool may be any value between 1 and CHAR_BIT. If the width of _Bool is greater than 1, a _Bool may have a well-defined value that is neither 0 or 1. My guess is most implementations define the width of _Bool as 1, but they don't have to (again, iirc, in C99 and C11). >>> It doesn't specify whether setting the padding bits to 1 results in a >>> non-value representation. >> >> That's probably an implementation-defined issue, is it not? > > I'm not sure whether it's implementation-defined or unspecified. > I don't see any mention of trap/non-value representations in Annex J. > > [...] 6.2.6.1 p 2; J.3.13 p 1, third subpoint.
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how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-07 08:28 -0300
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-07 08:33 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-07 13:13 -0700
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:43 -0700
Re: how cast works? Vir Campestris <vir.campestris@invalid.invalid> - 2024-08-12 11:51 +0100
Challenge/exercise problem - signum() function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 08:17 -0700
Re: Challenge/exercise problem - signum() function Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2024-08-12 16:07 +0000
Re: Challenge/exercise problem - signum() function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 09:57 -0700
Re: how cast works? Dan Purgert <dan@djph.net> - 2024-08-07 20:00 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-07 13:26 -0700
Re: how cast works? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-07 23:00 +0000
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 08:14 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-08 14:23 +0100
Re: how cast works? Michael S <already5chosen@yahoo.com> - 2024-08-08 19:32 +0300
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 14:11 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-08 18:29 +0100
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 14:50 -0300
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 14:57 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-08 19:01 +0100
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 15:13 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 12:29 -0700
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-08 19:58 +0200
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-08 20:09 +0100
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 00:32 +0200
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 16:14 -0700
Re: how cast works? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-09 02:47 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 22:55 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 02:08 -0400
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 18:16 +0200
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 12:18 -0700
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:07 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-11 20:14 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 01:56 +0100
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 19:08 +0200
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-10 11:03 +0100
Re: how cast works? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-09 02:45 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 12:42 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 17:34 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-08 22:41 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 16:17 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 11:04 +0100
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 19:12 +0200
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-12 15:36 +0100
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 13:57 -0400
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 21:59 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 14:47 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-10 00:32 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 17:12 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 18:29 -0400
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-13 11:18 +0200
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-13 11:34 +0100
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-13 07:51 -0400
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-13 14:01 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-13 12:46 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-13 21:51 +0100
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-13 16:46 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-14 00:56 +0100
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-18 03:37 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 14:29 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 18:35 -0400
Re: how cast works? Kaz Kylheku <643-408-1753@kylheku.com> - 2024-08-09 21:30 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 14:57 -0700
Re: how cast works? Kaz Kylheku <643-408-1753@kylheku.com> - 2024-08-09 23:14 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 16:58 -0700
Re: how cast works? Kaz Kylheku <643-408-1753@kylheku.com> - 2024-08-10 00:06 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 17:27 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 20:31 -0400
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-10 01:11 +0100
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-13 11:23 +0200
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:32 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-09 18:35 -0400
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:27 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 12:23 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 21:31 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 13:49 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 22:01 +0100
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 00:33 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-12 12:21 +0100
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:46 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-12 02:00 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-11 20:23 -0700
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 20:37 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-11 21:33 -0700
Re: how cast works? Ben Bacarisse <ben@bsb.me.uk> - 2024-08-12 16:57 +0100
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 10:04 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-12 13:35 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-09 07:57 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-09 16:25 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 12:06 -0700
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 19:20 +0200
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-09 15:54 -0300
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-09 16:05 -0300
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 21:43 +0200
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 13:28 -0700
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 22:01 +0200
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-10 11:17 +0100
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-10 10:15 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-10 17:14 +0100
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-10 20:01 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-10 17:10 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-11 09:23 -0300
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-11 13:30 +0100
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-11 14:16 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-11 13:38 -0700
Re: how cast works? Bart <bc@freeuk.com> - 2024-08-12 12:24 +0100
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 13:26 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-09 18:01 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 14:53 -0700
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-09 12:03 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-09 16:22 -0300
Re: how cast works? David Brown <david.brown@hesbynett.no> - 2024-08-09 00:36 +0200
Re: how cast works? Dan Purgert <dan@djph.net> - 2024-08-08 14:08 +0000
Re: how cast works? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-09 02:42 +0000
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-07 13:08 -0700
Re: how cast works? Thiago Adams <thiago.adams@gmail.com> - 2024-08-08 08:35 -0300
Re: how cast works? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-08 12:39 -0700
Re: how cast works? James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-08-08 18:40 -0400
Re: how cast works? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-11 17:15 -0700
Is there an audio book version (Was: how cast works?) gazelle@shell.xmission.com (Kenny McCormack) - 2024-08-08 16:19 +0000
Re: how cast works? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-08-07 23:03 +0000
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