Groups > comp.lang.java.programmer > #12275

Re: Fixed-point arithmetic library

From	Tom Anderson <twic@urchin.earth.li>
Newsgroups	comp.lang.java.programmer
Subject	Re: Fixed-point arithmetic library
Date	2012-02-23 21:16 +0000
Organization	Stack Usenet News Service
Message-ID	<alpine.DEB.2.00.1202232115290.23797@urchin.earth.li> (permalink)
References	<alpine.DEB.2.00.1202222012550.5334@urchin.earth.li> <9ql7jpF3mnU1@mid.individual.net> <nksak719f3qtnogigv4cunsurbv0ti1rk7@4ax.com>

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On Wed, 22 Feb 2012, Gene Wirchenko wrote:

> On Wed, 22 Feb 2012 23:13:06 +0100, Robert Klemme
> <shortcutter@googlemail.com> wrote:
>
>> On 22.02.2012 22:39, Tom Anderson wrote:
>>
>>> I would quite like to represent some numbers in fixed point, and do
>>> arithmetic with them.
>>
>> Fixed point math is susceptible to precision issues which can be more
>> severe than those of float and double: 0.01 * 0.2 -> 0.00
>
>     Only if the target precision does not have enough decimal places.
>
>     I have been working with fixed-point arithmetic in JavaScript so
> that I can add dollar amounts exactly.  Maybe OP has something similar
> in mind, though with the number of digits of precision that he wants
> before the decimal point, I hope it is not currency-related.

It is currency-related. What's wrong with that?

tom

-- 
Lilith doesn't exist, but it's an interesting story.

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Fixed-point arithmetic library Tom Anderson <twic@urchin.earth.li> - 2012-02-22 21:39 +0000
  Re: Fixed-point arithmetic library Jan Burse <janburse@fastmail.fm> - 2012-02-22 22:59 +0100
    Re: Fixed-point arithmetic library Tom Anderson <twic@urchin.earth.li> - 2012-02-23 21:15 +0000
      Re: Fixed-point arithmetic library markspace <-@.> - 2012-02-23 13:53 -0800
      Re: Fixed-point arithmetic library Robert Klemme <shortcutter@googlemail.com> - 2012-02-23 23:21 +0100
      Re: Fixed-point arithmetic library Jan Burse <janburse@fastmail.fm> - 2012-02-24 00:02 +0100
  Re: Fixed-point arithmetic library Robert Klemme <shortcutter@googlemail.com> - 2012-02-22 23:13 +0100
    Re: Fixed-point arithmetic library Gene Wirchenko <genew@ocis.net> - 2012-02-22 14:59 -0800
      Re: Fixed-point arithmetic library Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-23 01:05 +0000
        Re: Fixed-point arithmetic library Tom Anderson <twic@urchin.earth.li> - 2012-02-23 21:21 +0000
          Re: Fixed-point arithmetic library Gene Wirchenko <genew@ocis.net> - 2012-02-23 13:49 -0800
      Re: Fixed-point arithmetic library Tom Anderson <twic@urchin.earth.li> - 2012-02-23 21:16 +0000
        Re: Fixed-point arithmetic library Gene Wirchenko <genew@ocis.net> - 2012-02-23 14:03 -0800
          Re: Fixed-point arithmetic library Lew <noone@lewscanon.com> - 2012-02-23 14:42 -0800
            Re: Fixed-point arithmetic library Gene Wirchenko <genew@ocis.net> - 2012-02-23 15:08 -0800
        Re: Fixed-point arithmetic library Martin Gregorie <martin@address-in-sig.invalid> - 2012-02-23 23:05 +0000
    Re: Fixed-point arithmetic library glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-02-27 00:59 +0000
      Re: Fixed-point arithmetic library Arne Vajhøj <arne@vajhoej.dk> - 2012-02-26 20:50 -0500
        Re: Fixed-point arithmetic library Robert Klemme <shortcutter@googlemail.com> - 2012-02-27 07:32 +0100
          Re: Fixed-point arithmetic library Jan Burse <janburse@fastmail.fm> - 2012-02-27 13:46 +0100
  Re: Fixed-point arithmetic library Roedy Green <see_website@mindprod.com.invalid> - 2012-02-24 16:26 -0800

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