Message-Id:	<4.1.19981218094138.00a7cf00@hal.nt.tuwien.ac.at>
X-Sender:	tony AT dictator DOT nt DOT tuwien DOT ac DOT at
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Date:	Fri, 18 Dec 1998 09:52:51 +0100
To:	djgpp AT delorie DOT com
From:	Anton Helm <tony AT dictator DOT nt DOT tuwien DOT ac DOT at>
Subject:	RE: sin() and cos() ???
In-Reply-To:	<199812171828.SAA24751@remus.clara.net>
References:	<199812171034 DOT FAA02881 AT delorie DOT com>
Mime-Version:	1.0
Reply-To:	djgpp AT delorie DOT com

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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