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Groups > comp.lang.c > #154740
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Bit Swizzling |
| Date | 2020-09-08 13:06 -0700 |
| Organization | None to speak of |
| Message-ID | <87y2lkjaol.fsf@nosuchdomain.example.com> (permalink) |
| References | (13 earlier) <rj8fce$ppd$1@dont-email.me> <_JCdnbMFysvEWcrCnZ2dnUU7-I_NnZ2d@giganews.com> <rj8gfn$32o$2@dont-email.me> <es2dnfpheKRAVcrCnZ2dnUU7-IfNnZ2d@giganews.com> <20200908114117.208@kylheku.com> |
Kaz Kylheku <793-849-0957@kylheku.com> writes:
[...]
> By and large, languages broadly agree on only the "BEDMAS" precedence
> rules everyone learns in elementary school. For other operators that
> language designers have invented, there is a large variance in
> precedences and other details.
>
> (Not all languages, have BEDMAS, either. Smalltalk is an example of a
> language in which operators are reduced left to right, because they are
> just method application, or something like that: x + y * z means (x +
> y) * x).
And I think APL groups right-to-left (though that's probably an
oversimplification).
Note that BEDMAS doesn't entirely cover even the obvious set of
precedence rules in C. The "E" is exponentiation, and C doesn't have
an exponentation operator. It also omits assignment (C's treatment
of assignment as an operator can be surprising to newcomers).
The parentheses in
x = (y + z);
are definitely superfluous.
It might be interesting to collect a list of *which* of C's operator
precedence rules are obvious enough that parentheses don't add clarity.
But it would be impossible to reach universal agreement on any such
list, and clarity depends on context. For example, sometimes I might
consider
a || b && c
to be clear enough, but I'd *probably* add parentheses.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */
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Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@nospicedham.gmail.com> - 2020-09-04 20:33 -0400
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-05 12:36 +0100
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-05 15:30 +0100
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-05 11:29 -0400
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-05 20:28 +0100
Re: Bit Swizzling kegs@provalid.com (Kent Dickey) - 2020-09-05 11:35 -0500
Re: Bit Swizzling Bart <bc@nospicedham.freeuk.com> - 2020-09-05 12:33 +0100
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-05 20:55 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-05 15:18 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-06 10:17 +0200
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-07 07:06 +0000
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-07 10:35 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-07 11:01 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-07 20:07 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-07 14:19 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-07 20:39 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-07 15:13 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 12:21 +0200
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-08 12:51 +0100
Re: Bit Swizzling Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-09-08 05:18 -0700
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 15:20 +0200
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 15:56 +0000
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-08 12:17 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:31 +0200
Re: Bit Swizzling olcott <NoOne@NoWhere.com> - 2020-09-08 12:46 -0500
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:53 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-08 15:13 -0400
Re: Bit Swizzling (c++ versus c) olcott <NoOne@NoWhere.com> - 2020-09-08 14:59 -0500
Re: Bit Swizzling (c++ versus c) "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-08 21:45 -0400
Re: Bit Swizzling (c++ versus c) olcott <NoOne@NoWhere.com> - 2020-09-08 20:56 -0500
Re: Bit Swizzling (c++ versus c) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-09-08 19:49 -0700
Re: Bit Swizzling (c++ versus c) Juha Nieminen <nospam@thanks.invalid> - 2020-09-09 06:27 +0000
Re: Bit Swizzling (c++ versus c) Melzzzzz <Melzzzzz@zzzzz.com> - 2020-09-09 06:38 +0000
Re: Bit Swizzling (c++ versus c) David Brown <david.brown@hesbynett.no> - 2020-09-09 11:54 +0200
Re: Bit Swizzling (c++ versus c) olcott <NoOne@NoWhere.com> - 2020-09-09 09:21 -0500
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 16:31 +0000
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:35 +0200
Re: Bit Swizzling olcott <NoOne@NoWhere.com> - 2020-09-08 12:50 -0500
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:53 +0200
Re: Bit Swizzling olcott <NoOne@NoWhere.com> - 2020-09-08 13:09 -0500
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 18:48 +0000
Re: Bit Swizzling + [HP] olcott <NoOne@NoWhere.com> - 2020-09-08 14:09 -0500
Re: Bit Swizzling + [HP] Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-09-08 12:37 -0700
Re: Bit Swizzling + [x86utm] olcott <NoOne@NoWhere.com> - 2020-09-08 16:59 -0500
Re: Bit Swizzling + [HP] olcott <NoOne@NoWhere.com> - 2020-09-08 18:13 -0500
Re: Bit Swizzling + [HP] olcott <NoOne@NoWhere.com> - 2020-09-08 20:07 -0500
Re: Bit Swizzling + (HP refutation criteria) olcott <NoOne@NoWhere.com> - 2020-09-09 20:10 -0500
Re: Bit Swizzling + [HP] olcott <NoOne@NoWhere.com> - 2020-09-09 21:07 -0500
Re: Bit Swizzling + [HP refutation criteria] olcott <NoOne@NoWhere.com> - 2020-09-09 21:30 -0500
Re: Bit Swizzling + [HP refutation criteria] olcott <NoOne@NoWhere.com> - 2020-09-09 21:39 -0500
Re: Bit Swizzling + [HP] olcott <NoOne@NoWhere.com> - 2020-09-10 22:48 -0500
Re: Bit Swizzling Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-09-08 13:06 -0700
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-08 19:37 +0100
Re: Bit Swizzling David Brown <david.brown@hesbynett.no> - 2020-09-09 12:04 +0200
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 18:39 +0000
Re: Bit Swizzling Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-09-08 12:27 -0700
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-07 15:47 -0400
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 12:23 +0200
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 00:07 +0000
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 12:26 +0200
Re: Bit Swizzling scott@slp53.sl.home (Scott Lurndal) - 2020-09-08 15:50 +0000
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:06 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2020-09-08 13:13 -0400
Re: Bit Swizzling olcott <NoOne@NoWhere.com> - 2020-09-08 12:18 -0500
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 19:28 +0200
Re: Bit Swizzling Bart <bc@freeuk.com> - 2020-09-08 18:51 +0100
Re: Bit Swizzling olcott <NoOne@NoWhere.com> - 2020-09-08 13:02 -0500
Re: Bit Swizzling Bonita Montero <Bonita.Montero@gmail.com> - 2020-09-08 20:45 +0200
Re: Bit Swizzling Kaz Kylheku <793-849-0957@kylheku.com> - 2020-09-08 15:55 +0000
Re: Bit Swizzling olcott <NoOne@nospicedham.NoWhere.com> - 2020-09-08 11:25 -0500
Re: Bit Swizzling olcott <NoOne@nospicedham.NoWhere.com> - 2020-09-08 11:50 -0500
Re: Bit Swizzling Kaz Kylheku <793-849-0957@nospicedham.kylheku.com> - 2020-09-08 17:47 +0000
Re: Bit Swizzling "R.Wieser" <address@nospicedham.not.available> - 2020-09-08 20:26 +0200
Re: Bit Swizzling David Brown <david.brown@nospicedham.hesbynett.no> - 2020-09-08 22:00 +0200
Re: Bit Swizzling "Rick C. Hodgin" <rick.c.hodgin@nospicedham.gmail.com> - 2020-09-08 21:51 -0400
Re: Bit Swizzling "R.Wieser" <address@nospicedham.not.available> - 2020-09-09 10:53 +0200
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