ba237a9d91
Files correlati : Ricompilazione Demo : [ ] Commento : Aggiunti i sorgenti per Greenleaf Math Library (gfm.dll) git-svn-id: svn://10.65.10.50/trunk@10079 c028cbd2-c16b-5b4b-a496-9718f37d4682
73 lines
1.3 KiB
C
Executable File
73 lines
1.3 KiB
C
Executable File
/* DEC *SinglePaymentPresentValue(dst, intr, nper);
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*
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* ARGUMENT
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* DEC *dst,*intr;
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* int nper;
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*
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* DESCRIPTION
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* Calculates the present value of 1 dollar at the future time of
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* nper periods at an interest rate of intr percent per period.
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* dst = (1 + intr / 100) ^ -nper
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*
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* SIDE EFFECTS
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* The result is stored in dst.
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*
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* RETURNS
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* dst if successful, otherwise GM_NULL.
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*
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* POSSIBLE ERRORS
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* GM_NULLPOINTER
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* GM_ARGVAL
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*
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* AUTHOR
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* Jared Levy
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* Copyright (C) 1988-1990 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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*/
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#include <stdio.h>
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#include "gmsystem.h"
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DEC *SinglePaymentPresentValue(dst, intr, nper)
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DEC *dst,*intr;
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int nper;
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{
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DEC dtemp, *temp=&dtemp;
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int i;
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_MacStart(GM_SPPV);
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_MacInVarD(intr);
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_MacOutVarD(dst);
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/* interest rate must be greater than -100% */
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if (CompareDecimal(intr,&decMinusHundred)<=0) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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_MacDCopy(temp, intr);
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temp->dc.id +=2;
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(void) _AddDec80Bit(temp, temp, &decOne);
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i = _IntPwrDec80Bit(temp, temp, -nper);
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if (i==GM_OVERFLOW) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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if (_Sq5UnsTo4Uns(temp)!=GM_SUCCESS) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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_MacDCopy(dst, temp);
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/* can't have zero value */
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if (_MacIsDecZ(temp))
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_MacErr(GM_ARGVAL);
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_MacRet(temp);
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}
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