From:	Martin Ambuhl <mambuhl AT earthlink DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: angle
Date:	Thu, 04 Mar 1999 06:54:26 -0500
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 990304120705 DOT 1354K-100000 AT is>
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Eli Zaretskii wrote:
> 
> On Wed, 3 Mar 1999, Martin Ambuhl wrote:
> 
> > polar to_polar(vector v)
> > {
> >     polar p;
> >     p.r = sqrt(sqr(v.x) + sqr(v.y));
> 
> It's much better to use library function `hypot' to do this.  (Hint:
> try the above with v.x = v.y = 1.e160 or v.x = v.y = 1.e-160.)

But you we note that nothing in my post was non-standard C, while
hypot() is.  This is not the only improvement available if the
non-standard functions in djgpp's libm.a are used, btw.  Also note that
my post was an answer to a beginner's math question.

Also, note that the representation of the plane as
__complex__ double 
would have been cleaner, but even 'more' non-standard C.

-- 
Martin Ambuhl (mambuhl AT earthlink DOT net)
Note: mambuhl AT tiac DOT net will soon be inactive

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