Sender:	kaa AT intel DOT com
Message-Id:	<367A27BD.CA237860@intel.com>
Date:	Fri, 18 Dec 1998 10:00:29 +0000
From:	Kurt Alstrup <kurt DOT alstrup AT intel DOT com>
Organization:	Intel Denmark Aps
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To:	djgpp AT delorie DOT com
Subject:	Re: sin() and cos() ???
References:	<199812171034 DOT FAA02881 AT delorie DOT com> <4 DOT 1 DOT 19981218094138 DOT 00a7cf00 AT hal DOT nt DOT tuwien DOT ac DOT at>
Reply-To:	djgpp AT delorie DOT com

A better way would be to calculate pi once by eg

 double pi = 4 * atan(1.0);

it should give you pi in a precision suitable for the
math library.

Just my two cents ..

Anton Helm wrote:
> 
> At 18:27 17.12.98 +0000, Arthur wrote:
> 
> >I think in math.h, there is a definition called PI. This is much more
> >accurate than what you've got here.
> >
> >So you can use sin(x*PI/180); instead (easier).
> >
> 
> PI is not ANSI (checked) and as far as I know
> it isn't POSIX either (unchecked).
> 
> So if you want a portable code you should
> have a
> 
> #ifndef PI
> #define PI 3.1415.....
> #endif
> 
> somewhere (well, preferably in a *.h  file) in your program.
> 
> Although PI and M_PI are #defined on lots of systems you
> can't rely on them.
> 
> Tony

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