48 lines
792 B
C
48 lines
792 B
C
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/* DEC *ArcTangentDecimal(pDst,pSrc)
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*
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* ARGUMENT
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* DEC *pDst;
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* DEC *pSrc;
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*
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* DESCRIPTION
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* Sets pDst = the arctangent (in radians) of pSrc,
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* which always lies between -pi/2 and pi/2.
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*
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* RETURNS
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* Returns pointer to pDst if successful, otherwise a GM_NULL.
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*
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* POSSIBLE ERROR CODES
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*
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* GM_NULLPOINTER
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* GM_NOMEMORY
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*
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* AUTHOR
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* Jared Levy Aug 7, 1987
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* Copyright (C) 1987-1990 Greenleaf Software Inc. All rights reserved.
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*
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* MODIFICATIONS
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*
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*/
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#include <stdio.h>
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#include "gm.h"
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#include "gmsystem.h"
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DEC *ArcTangentDecimal(pDst,pSrc)
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DEC *pDst;
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DEC *pSrc;
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{
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_MacStart(GM_DATAN);
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_MacInVar(pSrc,GM_NULL);
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_MacOutVar(pDst,GM_NULL);
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_ATanDec80Bit(pDst, pSrc);
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/* reduce from 80-bit back to 64-bit */
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(void) _Sq5UnsTo4Uns(pDst);
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_MacRet(pDst);
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}
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