83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
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/* DEC *ConvPeriodicToYearly(yeari, peri, nper);
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*
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* ARGUMENT
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* DEC *peri, *yeari;
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* int nper;
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*
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* DESCRIPTION
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* Changes the interest rate per period to the interest rate per year.
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* For instance, a monthly rate is changed to a yearly rate.
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* Interest rates should are expressed as percentages.
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* peri is the period rate
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* nper is the number of compounding periods.
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* The resulting yearly rate is store in yeari.
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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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* yeari 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 *ConvPeriodicToYearly(yeari, peri, nper)
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DEC *peri, *yeari;
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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_PTOY);
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_MacInVarD(peri);
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_MacOutVarD(yeari);
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/* nper must be >= 1 */
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if ((nper<=0)
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||CompareDecimal(peri,&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, peri);
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temp->dc.id+=2;
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(void) ConvLongToDecimal(dper, (long) nper);
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(void) _AddDec80Bit(temp, temp, &decOne);
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if (_IntPwrDec80Bit(temp, temp, nper)!=GM_SUCCESS) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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(void) _SubDec80Bit(temp, temp, &decOne);
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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(yeari,temp);
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_MacRet(yeari);
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}
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