Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #139313

Re: Range-aware modulo operator -%

Path csiph.com!feeder.erje.net!2.eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed9.news.xs4all.nl!85.12.16.69.MISMATCH!peer02.ams1!peer.ams1.xlned.com!news.xlned.com!peer01.am4!peer.am4.highwinds-media.com!news.highwinds-media.com!fx33.am4.POSTED!not-for-mail
Subject Re: Range-aware modulo operator -%
Newsgroups comp.lang.c, comp.lang.c++
References <q040h4$bie$1@dont-email.me> <tGoVD.88490$Ck1.46277@fx18.am4> <q057a5$1pr$1@dont-email.me> <rfrVD.120946$gU6.41087@fx33.iad> <q05lng$k1l$1@dont-email.me> <A9xVD.313699$_35.734@fx46.iad> <q0d7ja$tgl$1@dont-email.me> <bWsWD.95201$fy7.3260@fx35.am4> <q0dq6u$hqr$1@dont-email.me> <PwvWD.153560$ny2.49860@fx38.am4> <q0e1qc$t3p$1@dont-email.me> <9RxWD.81420$N45.2557@fx21.am4> <lnd0phmcjw.fsf@kst-u.example.com>
From Bart <bc@freeuk.com>
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3
MIME-Version 1.0
In-Reply-To <lnd0phmcjw.fsf@kst-u.example.com>
Content-Type text/plain; charset=utf-8; format=flowed
Content-Language en-GB
Content-Transfer-Encoding 7bit
Lines 29
Message-ID <O2zWD.105221$MB6.51536@fx33.am4> (permalink)
X-Complaints-To http://netreport.virginmedia.com
NNTP-Posting-Date Tue, 01 Jan 2019 01:06:54 UTC
Organization virginmedia.com
Date Tue, 1 Jan 2019 01:06:47 +0000
X-Received-Bytes 2200
X-Received-Body-CRC 280605361
Xref csiph.com comp.lang.c:139313 comp.lang.c++:62682

Cross-posted to 2 groups.

Show key headers only | View raw

On 01/01/2019 00:44, Keith Thompson wrote:
> Bart <bc@freeuk.com> writes:
> [...]
>> If you write if(x), while(x), or for(;x;), then it automatically applies
>> the effective equivalent of !! to give a true (x!=0) or false (x==0)
>> result. (The same with (x && y) and any such combinations.)
> [...]
> 
> That's one way to describe it.  It's now how the standard describes it.
> 
> For example, the description of the "if" statement says "the first
> substatement is executed if the expression compares unequal to 0",
> which I find clearer and simpler than your reformulation.

That's the whole expression. It doesn't really explain how a complex 
expression ends up as zero or not zero. Or the difference between A && B 
when B is 'b==x' and when B is just 'b'.

 From a design and implementation point of view, you have to go into it 
in more detail.

Perhaps simpler might be to say that operands of if(), while(), for(;;), 
&&, || unary !, need to be either already Bool, or have to be converted 
to Bool.

It is that last that can also be done with !!.

-- 
bart

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-27 21:09 -0500
  Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-27 21:34 -0500
    Re: Range-aware modulo operator -% "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2018-12-28 05:37 +0100
    Re: Range-aware modulo operator -% James Kuyper <jameskuyper@alumni.caltech.edu> - 2018-12-29 16:04 -0500
      Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-29 19:13 -0500
  Re: Range-aware modulo operator -% Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-28 03:05 +0000
    Re: Range-aware modulo operator -% Robert Wessel <robertwessel2@yahoo.com> - 2018-12-27 21:31 -0600
      Re: Range-aware modulo operator -% Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-28 04:20 +0000
    Re: Range-aware modulo operator -% James Kuyper <jameskuyper@alumni.caltech.edu> - 2018-12-27 19:32 -0800
      Re: Range-aware modulo operator -% Ben Bacarisse <ben.usenet@bsb.me.uk> - 2018-12-28 04:18 +0000
  Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-28 12:29 +0000
    Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-28 08:10 -0500
      Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-28 10:25 -0500
        Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-28 15:56 +0000
          Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-28 17:26 -0500
            Re: Range-aware modulo operator -% Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2018-12-28 23:45 +0100
        Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-28 11:44 -0500
        Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-28 12:16 -0500
          Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-28 17:08 -0500
            Re: Range-aware modulo operator -% Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-28 15:01 -0800
            Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-31 09:04 -0500
              Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-31 18:07 +0000
                Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-31 14:22 -0500
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-31 21:05 +0000
                Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-31 16:32 -0500
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-31 23:43 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2018-12-31 16:44 -0800
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-01 01:06 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2018-12-31 19:06 -0800
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-01 11:32 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2019-01-01 12:48 -0800
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-01 23:54 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2019-01-01 16:09 -0800
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-02 00:49 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2019-01-01 17:53 -0800
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-02 02:36 +0000
                Leader Kiki is not going to like this... (Was: Range-aware modulo operator -%) gazelle@shell.xmission.com (Kenny McCormack) - 2019-01-02 08:36 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2019-01-02 00:38 -0800
                Re: Range-aware modulo operator -% rbowman <bowman@montana.com> - 2019-01-01 22:40 -0700
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2019-01-02 12:12 +0000
                Re: Range-aware modulo operator -% gazelle@shell.xmission.com (Kenny McCormack) - 2019-01-01 01:53 +0000
                Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-31 16:57 -0500
                Re: Range-aware modulo operator -% Bart <bc@freeuk.com> - 2018-12-31 22:33 +0000
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2018-12-31 13:34 -0800
                Re: Range-aware modulo operator -% Richard Damon <Richard@Damon-Family.org> - 2018-12-31 16:43 -0500
                Re: Range-aware modulo operator -% Keith Thompson <kst-u@mib.org> - 2018-12-31 15:20 -0800
  Re: Range-aware modulo operator -% Eduardo <abdulai60@gmail.com> - 2018-12-28 07:18 -0800
    Re: Range-aware modulo operator -% "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2018-12-28 11:45 -0500

csiph-web