Message-ID:	<19991230162131.32477.qmail@hotmail.com>
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From:	"=?big5?B?bWtlcm9wcGkgxVGk/atnrFA=?=" <m_keroppi AT hotmail DOT com>
To:	<djgpp AT delorie DOT com>
Subject:	Re: Inverse trigonometry functions in Djgpp
Date:	Thu, 30 Dec 1999 11:18:23 -0500
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Reply-To:	djgpp AT delorie DOT com

In radians, multiply by 360, divide by 2pi

==
Atan () - don't work!
Here is a bit of my code:

float direction;

direction = atan ( 120 / 90 );
printf ("%f", direction");

And output is this:
0.927295

But with calculator it is:
tan^-1 (120 / 90) = 53.1301023...

Is atan () right inverse tan function?

Greetings,
Jarkko DOT Kahkonen AT mbnet DOT REMOVETHAT DOT fi

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