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
92 lines
2.1 KiB
C
Executable File
92 lines
2.1 KiB
C
Executable File
/* DEC *ConvEffectiveToNominal(nom, eff, nper)
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*
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* ARGUMENT
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* DEC *eff,*nom;
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* int nper;
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*
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* DESCRIPTION
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* Changes to a nominal interest rate (the stated percentage before
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* compounding is considered) from an effective interest rate due to the
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* effects of compound interest. eff is the effective interest rate and
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* nper is the number of compounding periods. The resulting nominal
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* rate is stored in nom.
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* nper is the number of compounding periods, and is GM_CONTINUOUS
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* for continuous compounding.
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* finite compounding: eff = (1 + nom / nper) ^ nper
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* continuous compounding: eff = e^nom - 1
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*
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* SIDE EFFECTS
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* nom is set to the effective percentage interest rate
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*
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* RETURNS
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* nom 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) 1989-1990 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 *ConvEffectiveToNominal(nom, eff, nper)
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DEC *eff,*nom;
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int nper;
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{
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DEC dtemp, *temp=&dtemp, ddper, *dper=&ddper;
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_MacStart(GM_EFFTONOM);
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_MacInVarD(eff);
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_MacOutVarD(nom);
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/* nper must be >= 1 if not continuous compounding */
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if (((nper<=0)&&(nper!=GM_CONTINUOUS))
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||CompareDecimal(eff,&decMinusHundred)<=0) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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/* convert percent to decimal */
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_MacDCopy(temp, eff);
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temp->dc.id+=2;
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if (nper==GM_CONTINUOUS) { /* continuous compounding */
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(void) _AddDec80Bit(temp, temp, &decOne);
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(void) _LnDec80Bit(temp, temp);
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}
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else { /* finite compounding */
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(void) ConvLongToDecimal(dper, (long) nper);
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(void) _AddDec80Bit(temp, temp, &decOne);
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(void) _LnDec80Bit(temp, temp);
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(void) _DivDec80Bit(temp, temp, dper);
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(void) _ExpDec80Bit(temp, temp);
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(void) _SubDec80Bit(temp, temp, &decOne);
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(void) _MulDec80Bit(temp, temp, dper);
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}
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/* convert decimal to percent */
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if (temp->dc.id>=2)
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temp->dc.id-=2;
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else {
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(void) ConvLongToDecimal(dper, 100L);
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(void) _MulDec80Bit(temp, temp, dper);
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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(nom,temp);
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_MacRet(nom);
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}
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