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Date: Sat, 27 Feb 1999 02:15:19 -0500
To: djgpp AT delorie DOT com
From: Paul Derbyshire <pderbysh AT usa DOT net>
Subject: Re: sin, cos ??
In-Reply-To: <36D5B053.2AA88FD6@cartsys.com>
References: <36d2f284 DOT 0 AT news DOT sbbs DOT se>
 <199902231842 DOT NAA15055 AT envy DOT delorie DOT com>
 <7b26kt$g5n AT chronicle DOT concentric DOT net>
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Reply-To: djgpp AT delorie DOT com

At 12:19 PM 2/25/99 -0800, you wrote:
>Paradox wrote:
>> 
>> Is there another function that uses degrees?
>
>No, but you can easily convert between the two.
>
>#include <math.h>
>#define DEG2RAD(deg) ((deg)*(M_PI/180.0))
>#define RAD2DEG(rad) ((rad)*(180.0/M_PI))

Ack! Macros!

const long double pi = 3.141592653589793

template <class F> // 'F' as in 'Floating point'
inline F deg2rad (F deg) { return deg*pi/180.0; }

template <class F>
inline F rad2deg (F rad) { return 180.0*rad/pi; }

There. Nice and type-safe and free of bogons with arguments that have side
effects. More readable too, just as inlined and quick, and moreover, if you
have egcs you can stick these in your own namespace and keep them from
cluttering the global one.

-- 
   .*.  "Clouds are not spheres, mountains are not cones, coastlines are not
-()  <  circles, and bark is not smooth, nor does lightning travel in a
   `*'  straight line."    -------------------------------------------------
        -- B. Mandelbrot  |http://surf.to/pgd.net
_____________________ ____|________     Paul Derbyshire     pderbysh AT usa DOT net
Programmer & Humanist|ICQ: 10423848|