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

Groups > comp.lang.java.programmer > #35765

Re: double == double

Path csiph.com!aioe.org!.POSTED!not-for-mail
From Arne Vajhøj <arne@vajhoej.dk>
Newsgroups comp.lang.java.programmer
Subject Re: double == double
Date Sat, 15 Oct 2016 10:32:50 -0400
Organization Aioe.org NNTP Server
Lines 22
Message-ID <nttemi$mt3$1@gioia.aioe.org> (permalink)
References <double-20161012130409@ram.dialup.fu-berlin.de> <ntledh$lfi$1@dont-email.me> <8737k0qd38.fsf@golem.phantasia.org> <87zim5es30.fsf@golem.phantasia.org> <ntta21$osp$1@dont-email.me>
NNTP-Posting-Host PBuS014lhzVyHjLbXmo/ZQ.user.gioia.aioe.org
Mime-Version 1.0
Content-Type text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding 7bit
X-Complaints-To abuse@aioe.org
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0
X-Notice Filtered by postfilter v. 0.8.2
Xref csiph.com comp.lang.java.programmer:35765

Show key headers only | View raw

On 10/15/2016 9:13 AM, Eric Sosman wrote:
>     The scare quotes around "argument" seem appropriate.  I attempted
> to explain the basis of the simplistic "Don't use ==" advice, hoping
> that an informed understanding would trump blind obedience to some
> mysterious rule.  (Perhaps I was overly optimistic.)
>
>     There are instances (admittedly not many) where floating-point ==
> is reliable, appropriate, and "safe when used as directed."  It seems
> to me that someone who can distinguish the safe from the unsafe cases
> will be a better programmer than someone who closes his mind and simply
> says "Never use ==, it's sometimes dangerous."

But I would say that someone that even though a particular use of
double == is safe still consider alternatives that are less fragile
to break with future code modifications is a better software engineer
than those who reason that since they can see it is safe then all
future maintainers of the code will understand the issue and keep
it safe.

Arne

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

Thread

Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-12 09:39 -0400
  Re: double == double Michael Jung <miju@golem.phantasia.org> - 2016-10-13 21:10 +0200
    Re: double == double Michael Jung <miju@golem.phantasia.org> - 2016-10-15 14:04 +0200
      Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-15 09:13 -0400
        Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-15 10:32 -0400
          Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-15 10:46 -0400
            Re: double == double Michael Jung <miju@golem.phantasia.org> - 2016-10-15 17:44 +0200
            Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-15 17:36 +0100
              Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-15 14:15 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-15 19:41 +0100
            Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-15 20:39 -0400
      Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-15 10:41 -0400
        Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-15 23:09 +0100
          Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-15 18:28 -0400
            Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 03:13 +0100
              Re: double == double Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-16 08:37 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 14:06 +0100
          Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-15 20:30 -0400
            Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 03:16 +0100
              Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 03:18 +0100
              Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-16 09:45 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 14:51 +0100
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-16 11:24 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 16:43 +0100
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-16 12:54 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 18:37 +0100
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-16 14:14 -0400
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-16 22:19 +0100
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-16 22:49 -0400
                Re: double == double a.laforgia@gmail.com - 2016-10-17 01:53 -0700
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-17 19:04 +0200
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-17 20:17 +0100
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-17 23:11 +0200
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-17 22:46 +0100
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-18 18:55 +0200
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-18 18:52 +0100
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-20 15:03 +0200
                True O-O [Was: double == double] Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-10-17 18:06 -0400
                Re: True O-O Patrick Roemer <sangamon@netcologne.de> - 2016-10-18 18:32 +0200
                Re: True O-O [Was: double == double] Arne Vajhøj <arne@vajhoej.dk> - 2016-10-19 22:09 -0400
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-19 21:58 -0400
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-17 18:58 +0200
                Re: double == double 4ndre4 <626401fd-4bc7-4f8f-b641-563ae0f72920@626401fd-4bc7-4f8f-b641-563ae0f72920.invalid> - 2016-10-17 20:32 +0100
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-17 23:21 +0200
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-19 21:38 -0400
                Re: double == double Arne Vajhøj <arne@vajhoej.dk> - 2016-10-19 21:47 -0400
                Re: double == double Patrick Roemer <sangamon@netcologne.de> - 2016-10-20 15:01 +0200

csiph-web