Re: How to div only once to get remainder and quotient?

From	Spiros Bousbouras <spibou@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: How to div only once to get remainder and quotient?
Message-ID	<f2yg2fy9e3dU1p2f1R@bongo-ra.co> (permalink)
References	(1 earlier) <jWwaG.513769$5X1.255300@fx06.am4> <r4e6kb$fk8$1@dont-email.me> <mxyaG.967120$Gh7.962352@fx45.iad> <r4edml$t02$6@dont-email.me> <r4ehuh$r40$1@dont-email.me>
Organization	virginmedia.com
Date	2020-03-14 08:35 +0000

Show all headers | View raw

On Thu, 12 Mar 2020 19:51:44 -0400
Lew Pitcher <lew.pitcher@digitalfreehold.ca> wrote:
> On March 12, 2020 18:39, Francis Assissi wrote:
> 
> >>   *ptr = '0' + (number & 1);
> > *ptr = '0' ^ number & 1;
> 
> While both statements generate the same results,

They generate the same results  iff  '0' is an even number and the standard
does not guarantee this , it only guarantees that  '1' == '0' + 1

> I find the first statement
> >>   *ptr = '0' + (number & 1);
> clearer as to it's intent. This statement says "*ptr shall contain either 
> the character '0', or the character '0'+1".
> 
> On the other hand
> > *ptr = '0' ^ number & 1;
> says, to me, "*ptr shall contain either an arbitrary set of bits in one 
> pattern or an arbitrary set of bits in a different pattern". The statement 
> implies, to me, that it is inconsequential that the patterns of bits are the 
> same as '0' and '0'+1.

Indeed if '0' is odd and  number  is odd then it would be  '0' - 1  .

Thread

How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-12 20:18 +0000
  Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-12 20:26 +0000
    Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-12 20:30 +0000
      Re: How to div only once to get remainder and quotient? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-03-12 20:40 -0700
    Re: How to div only once to get remainder and quotient? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-03-12 16:38 -0400
      Re: How to div only once to get remainder and quotient? richard@cogsci.ed.ac.uk (Richard Tobin) - 2020-03-12 20:44 +0000
        Re: How to div only once to get remainder and quotient? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-03-12 17:00 -0400
          Re: How to div only once to get remainder and quotient? richard@cogsci.ed.ac.uk (Richard Tobin) - 2020-03-13 09:35 +0000
            Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 11:12 +0100
      Re: How to div only once to get remainder and quotient? scott@slp53.sl.home (Scott Lurndal) - 2020-03-12 22:16 +0000
        Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-12 22:39 +0000
          Re: How to div only once to get remainder and quotient? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-03-12 19:51 -0400
            Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 00:47 +0000
              Re: How to div only once to get remainder and quotient? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-03-12 23:02 -0400
              Re: How to div only once to get remainder and quotient? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-03-12 20:39 -0700
            Re: How to div only once to get remainder and quotient? scott@slp53.sl.home (Scott Lurndal) - 2020-03-13 15:00 +0000
            Re: How to div only once to get remainder and quotient? Spiros Bousbouras <spibou@gmail.com> - 2020-03-14 08:35 +0000
  Re: How to div only once to get remainder and quotient? jak <nospam@please.ty> - 2020-03-12 21:55 +0100
    Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-12 21:56 +0000
      Re: How to div only once to get remainder and quotient? jak <nospam@please.ty> - 2020-03-12 23:26 +0100
  Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-12 21:11 +0000
    Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-12 21:57 +0000
    Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-12 22:23 +0000
      Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 01:05 +0000
  Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 11:33 +0100
    Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 11:03 +0000
      Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 14:31 +0100
        Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 15:12 +0000
          Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 18:03 +0100
            Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 18:01 +0000
              Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 19:06 +0100
                Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 19:12 +0000
      Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 13:34 +0000
        Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 15:00 +0000
          Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 20:34 +0000
            Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-13 21:41 +0000
              Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-14 01:47 +0000
                Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-14 12:24 +0000
                Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-14 16:35 +0000
                Re: How to div only once to get remainder and quotient? Bart <bc@freeuk.com> - 2020-03-14 18:05 +0000
  Re: How to div only once to get remainder and quotient? already5chosen@yahoo.com - 2020-03-13 03:52 -0700
  Re: How to div only once to get remainder and quotient? Guillaume <message@bottle.org> - 2020-03-13 16:41 +0100
    Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-13 16:07 +0000
      Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-13 18:10 +0100
        Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-13 19:32 +0000
          Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-13 16:08 -0400
            Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-13 20:50 +0000
              Re: How to div only once to get remainder and quotient? jameskuyper@stellarscience.com - 2020-03-13 16:05 -0700
                Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-13 23:42 +0000
                Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-13 19:59 -0400
                Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-14 00:07 +0000
                Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-13 20:27 -0400
                Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-14 01:37 +0000
                Re: How to div only once to get remainder and quotient? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-04-02 07:45 -0700
                Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-02 08:09 -0700
                Re: How to div only once to get remainder and quotient? gazelle@shell.xmission.com (Kenny McCormack) - 2020-04-02 16:03 +0000
                Re: How to div only once to get remainder and quotient? Öö Tiib <ootiib@hot.ee> - 2020-04-04 04:31 -0700
                Invitations (Was: How to div only once to get remainder and quotient?) gazelle@shell.xmission.com (Kenny McCormack) - 2020-04-04 17:04 +0000
                Re: Invitations (Was: How to div only once to get remainder and quotient?) Öö Tiib <ootiib@hot.ee> - 2020-04-07 00:10 -0700
      Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-13 14:30 -0400
        Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-13 20:54 +0000
          Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 23:10 +0000
          Re: How to div only once to get remainder and quotient? James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-03-13 20:18 -0400
            Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-14 00:34 +0000
              Re: How to div only once to get remainder and quotient? Francis Assissi <invalid@invalid.invalid> - 2020-03-14 01:47 +0000
  Re: How to div only once to get remainder and quotient? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-03-13 14:39 -0600
    Re: How to div only once to get remainder and quotient? felix@palmen-it.de (Felix Palmen) - 2020-03-13 22:10 +0100
      Re: How to div only once to get remainder and quotient? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-03-13 16:26 -0600
      Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-14 16:41 +0100
        Re: How to div only once to get remainder and quotient? felix@palmen-it.de (Felix Palmen) - 2020-03-14 17:00 +0100
          Re: How to div only once to get remainder and quotient? David Brown <david.brown@hesbynett.no> - 2020-03-15 13:39 +0100
    Re: How to div only once to get remainder and quotient? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-03-13 23:07 +0000
      Re: How to div only once to get remainder and quotient? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2020-03-14 12:13 -0600
  Re: How to div only once to get remainder and quotient? Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-07 09:35 +0200

csiph-web