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Re: Programming question determining two circle's relation

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In article <qIidnUiax7X4PiHQnZ2dnUVZ_sWdnZ2d@earthlink.com>,
 Patricia Shanahan <pats@acm.org> wrote:

> On 4/30/2011 2:25 PM, John B. Matthews wrote:
> > In article
> > <511ca68f-7866-4658-9b2b-b1c0c013a030@a21g2000prj.googlegroups.com>,
> >   byhesed<byhesed@gmail.com>  wrote:
> >
> >> On 4ø˜30¿|, ø¿»Ÿ6‡ˆ08†-, Patricia Shanahan<p...@acm.org>  wrote:
> >>> [...]
> >>>
> >>> If you have a calculation you need to do a lot, why not write and
> >>> test a separate method to do it, rather than writing the
> >>> calculation in-line repeatedly?
> >>>
> >>> [...]
> >>
> >> I know the source code I had posted is silly.
> >> I do not perform any optimization because it is just an example.
> >
> > I would argue that the re-factoring suggested by Patricia is an
> > opportunity to reduce error, both now and in future development or
> > maintenance. I know it's tempting to dismiss the work as temporary, but
> > we've all seen a prototype sneak into production.
> >
> 
> I certainly proposed it as a means to the achieving correct code.
> 
> Not taking the square root, and doing some comparisons between squares
> of distances, is a performance optimization that may or may not be
> useful, depending on how often the code is run. It is premature
> optimization, and a very bad idea, until the code is running correctly.

I see what you mean, now. I had thought some re-factoring would lend 
clarity, but I over-estimated the benefit.

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

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Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 01:33 -0700
  Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 01:59 -0700
    Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 17:51 +0200
      Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 09:01 -0700
        Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 18:33 +0200
    Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 02:03 -0700
  Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 02:50 -0700
    Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 08:42 -0700
      Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 17:59 +0200
    Re: Programming question determining two circle's relation "John B. Matthews" <nospam@nospam.invalid> - 2011-04-30 17:25 -0400
      Re: Programming question determining two circle's relation Patricia Shanahan <pats@acm.org> - 2011-04-30 17:03 -0700
        Re: Programming question determining two circle's relation "John B. Matthews" <nospam@nospam.invalid> - 2011-05-01 03:10 -0400
  Re: Programming question determining two circle's relation Patricia Shanahan <pats@acm.org> - 2011-04-30 02:08 -0700
  Re: Programming question determining two circle's relation Roedy Green <see_website@mindprod.com.invalid> - 2011-04-30 11:49 -0700

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