From: Jari Oksanen <joksanen AT neopoli DOT lpt DOT fi>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: math.h sin() function returns wrong value
Date: Fri, 11 Jul 1997 09:12:35 +0300
Organization: Univ Helsinki
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Gareth Davies wrote:
>   trigangle = angle * 1.40625;          /* conversion from an allegro fixed point
>   printf("trigangle = %f\n", trigangle);           style angle, out of 256 instead
> of 360 */

I think this should be
    triangle = angle * 0.024543926;
That means, sin() takes angle in radians instead of degrees. 
-- 
Jari Oksanen -- Lahtis, Finland / Luokta, Suopma / Lahti, Häme.