Groups > comp.lang.java.programmer > #14374

Re: Sorting numeric strings

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.java.programmer
Subject	Re: Sorting numeric strings
Date	2012-05-07 17:48 +0000
Organization	Aioe.org NNTP Server
Message-ID	<jo91u7$h3c$1@speranza.aioe.org> (permalink)
References	(5 earlier) <29053378.63.1336093904131.JavaMail.geo-discussion-forums@pbctc10> <jo1cje$o4a$1@localhost.localdomain> <gkh8q712jvs0scpgtil3ull4cssmis5v1k@4ax.com> <jo1p6k$ra8$2@localhost.localdomain> <pj1gq7tjiuh46n06r2m05iprf0vbvihm70@4ax.com>

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Gene Wirchenko <genew@ocis.net> wrote:

(snip)
>     Floating point can represent some integer values exactly.  The
> IEEE 754 64-bit format has 53 bits of precision.  This is not quite 16
> digits of precision.  Stick with integer values in the range
> (-10^15,10^15) (an exclusive range), and they will all be represented
> exactly.

I believe that addition, subtraction, and multiplication should
give the right answer as long as it stays within range.

Divide is less obvious. Are you sure that there are no cases
where divide will round incorrectly?

-- glen

Thread

Sorting numeric strings Ben <no@way.com> - 2012-04-30 21:27 -0400
  Re: Sorting numeric strings Arne Vajhøj <arne@vajhoej.dk> - 2012-04-30 21:39 -0400
  Re: Sorting numeric strings Gene Wirchenko <genew@ocis.net> - 2012-05-01 10:30 -0700
  Re: Sorting numeric strings Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-01 10:53 -0700
    Re: Sorting numeric strings Roedy Green <see_website@mindprod.com.invalid> - 2012-05-01 14:50 -0700
      Re: Sorting numeric strings Patricia Shanahan <pats@acm.org> - 2012-05-01 15:02 -0700
        Re: Sorting numeric strings Roedy Green <see_website@mindprod.com.invalid> - 2012-05-02 14:36 -0700
          Re: Sorting numeric strings Gene Wirchenko <genew@ocis.net> - 2012-05-02 19:57 -0700
          Re: Sorting numeric strings Dr J R Stockton <reply1218@merlyn.demon.co.uk.not.invalid> - 2012-05-03 19:41 +0100
            Re: Sorting numeric strings Roedy Green <see_website@mindprod.com.invalid> - 2012-05-03 17:40 -0700
              Re: Sorting numeric strings Lew <lewbloch@gmail.com> - 2012-05-03 18:11 -0700
                Re: Sorting numeric strings Martin Gregorie <martin@address-in-sig.invalid> - 2012-05-04 20:01 +0000
                Re: Sorting numeric strings Gene Wirchenko <genew@ocis.net> - 2012-05-04 14:19 -0700
                Re: Sorting numeric strings Martin Gregorie <martin@address-in-sig.invalid> - 2012-05-04 23:36 +0000
                Re: Sorting numeric strings Dr J R Stockton <reply1218@merlyn.demon.co.uk.not.invalid> - 2012-05-06 17:50 +0100
                Re: Sorting numeric strings Gene Wirchenko <genew@ocis.net> - 2012-05-07 10:34 -0700
                Re: Sorting numeric strings Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-05-07 12:38 -0500
                Re: Sorting numeric strings glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-05-07 17:48 +0000
                Re: Sorting numeric strings Gene Wirchenko <genew@ocis.net> - 2012-05-07 11:42 -0700
  Re: Sorting numeric strings Roedy Green <see_website@mindprod.com.invalid> - 2012-05-01 13:38 -0700

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