Re: -2 ** 2

Newsgroups	comp.lang.javascript
Date	2017-05-09 09:55 -0700
References	<exponentiation-20170504145841@ram.dialup.fu-berlin.de> <slrnogmdu6.50n.jon+usenet@sable.unequivocal.eu> <gaJOA.467$Pq7.63@fx21.iad> <vksmgcp498jf6afkpqavb926g2rhaoj6uh@4ax.com> <CcSZSzP04OEZFwf4@invalid.uk.co.demon.merlyn.invalid>
Message-ID	<628d7e67-2f95-41d7-bd2e-913a75477b9e@googlegroups.com> (permalink)
Subject	Re: -2 ** 2
From	"Michael Haufe (TNO)" <tno@thenewobjective.com>

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Dr J R Stockton wrote:
> Javascript has two zeroes.  One is positive and the other is negative.
> They are equal in value; but it seems that (in Firefox & Chrome in WinXP
> on PC:) they have different square roots of equal value but different
> sign - at least, the following expression returns false :-
>                 1/Math.sqrt(-0) == 1/Math.sqrt(+0)
> That might represent a bug in ECMA 262 or its implementation.
> 
> Math.sqrt is not the only thing in JavaScript which can return -0 ; some
> while ago now, it became evident here that The Great Panjandrum Himself
> was inadequately aware of that, when the ability was at least useful and
> perhaps almost indispensable.
> 

See <http://2ality.com/2012/03/signedzero.html>

Thread

Re: -2 ** 2 Jon Ribbens <jon+usenet@unequivocal.eu> - 2017-05-04 14:13 +0000
  Re: -2 ** 2 Tim Streater <timstreater@greenbee.net> - 2017-05-04 16:56 +0100
    Re: -2 ** 2 Mark Lloyd <not@mail.invalid> - 2017-05-04 12:08 -0500
    Re: -2 ** 2 John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-04 20:02 +0100
    Re: -2 ** 2 Jon Ribbens <jon+usenet@unequivocal.eu> - 2017-05-04 23:44 +0000
      Re: -2 ** 2 "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-05 09:16 +0200
        Re: -2 ** 2 John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-05 09:56 +0100
          Re: -2 ** 2 "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-05 11:16 +0200
            Re: -2 ** 2 John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-06 10:27 +0100
              Re: -2 ** 2 "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-06 11:42 +0200
  Re: -2 ** 2 Robert Heller <heller@deepsoft.com> - 2017-05-04 11:01 -0500
  Re: -2 ** 2 Sam E <why.should.this@be.email.invalid> - 2017-05-04 12:04 -0500
    Re: -2 ** 2 John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-04 19:29 +0100
      Re: -2 ** 2 Tim Streater <timstreater@greenbee.net> - 2017-05-04 19:51 +0100
        Re: -2 ** 2 John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-05 09:41 +0100
        Re: -2 ** 2 Tim Slattery <tim@risingdove.com> - 2017-05-05 11:02 -0400
          Re: -2 ** 2 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-05 17:47 +0200
          Re: -2 ** 2 Tim Streater <timstreater@greenbee.net> - 2017-05-05 16:49 +0100
            Re: -2 ** 2 Tim Slattery <tim@risingdove.com> - 2017-05-06 11:21 -0400
              Re: -2 ** 2 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-06 19:04 +0200
                Re: -2 ** 2 Tim Slattery <tim@risingdove.com> - 2017-05-07 12:40 -0400
                Re: -2 ** 2 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-07 20:35 +0200
                Re: -2 ** 2 RobG <rgqld@iinet.net.au> - 2017-05-10 17:46 -0700
                Re: -2 ** 2 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-11 03:00 +0200
          Re: -2 ** 2 Mark Lloyd <not@mail.invalid> - 2017-05-05 23:20 -0500
          Re: -2 ** 2 Dr J R Stockton <reply1700@merlyn.demon.co.uk.invalid> - 2017-05-08 23:19 +0100
      Re: -2 ** 2 Dr J R Stockton <reply1700@merlyn.demon.co.uk.invalid> - 2017-05-08 23:16 +0100
        Re: -2 ** 2 "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-05-09 09:55 -0700
        Re: -2 ** 2 Dr J R Stockton <reply1700@merlyn.demon.co.uk.invalid> - 2017-05-10 17:39 +0100
          Re: -2 ** 2 Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-11 03:08 +0200

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