50 lines
782 B
C
50 lines
782 B
C
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/* DEC *SineDecimal(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 sine of pSrc radians.
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*
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* SIDE EFFECTS
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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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*
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* AUTHOR
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* Jared Levy Oct 16, 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 *SineDecimal(pDst,pSrc)
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DEC *pDst;
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DEC *pSrc;
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{
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DEC *temp, dtemp;
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_MacStart(GM_DSIN);
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_MacInVarD(pSrc);
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_MacOutVarD(pDst);
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/* sin(x) = cos(pi/2 - x) */
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temp = &dtemp;
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(void) _SubDec80Bit(temp, &decPiOver2, pSrc);
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_CosDec80Bit(pDst, temp);
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(void) _Sq5UnsTo4Uns(pDst);
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_MacRet(pDst);
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}
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