60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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/* int MagnitudeOfDecimal(pSrc);
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* ARGUMENT
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* DEC *pSrc;
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*
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* DESCRIPTION
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* returns the 'order of magnitude' of pSrc -- the exponent of the
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* largest power of 10 less than or equal to absolute value of pSrc.
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* Examples: MagnitudeOfDecimal(20) = 1
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* MagnitudeOfDecimal(200)=2
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* MagnitudeOfDecimal(2)=0
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* MagnitudeOfDecimal(-.2) = -1
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* MagnitudeOfDecimal(1)=0
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* MagnitudeOfDecimal(3.14)=0
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* MagnitudeOfDecimal(.003)= -3
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* MagnitudeOfDecimal(0) = -32767
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*
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* SIDE EFFECTS
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* None.
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*
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* RETURNS
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* The magnitude of pSrc.
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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 5 / 18 / 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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int MagnitudeOfDecimal(pSrc)
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DEC *pSrc;
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{
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SHORT p;
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_MacStart(GM_DMAG);
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_MacInVarI(pSrc);
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if (_MacIsDecZ(pSrc))
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_MacRet( -32767);
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/* finds pSrc->dc.sl in wrgGMPowersOfTen80Bit[] using a linear search */
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/* of 80-bit unsigned values */
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p = 1;
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while ((p<=24) &&
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(_CompareUnsArr(pSrc->dc.sl,
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&wrgGMPowersOfTen80Bit[5*p], 5) != -1))
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p++;
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_MacRet(p - 1 - pSrc->dc.id);
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}
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