127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
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/* DEC **DepreciateSumOfYearsTable(depr,remval, book, salv, life, partial);
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*
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* ARGUMENT
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* DEC **depr, **remval, *book, *salv, *partial;
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* int life;
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*
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* DESCRIPTION
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* Calculate several years' depreciation and remaining depreciable
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* value according to sum-of-the-years-digits depreciation.
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* The item has book value
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* book, salvage value salv, and lifetime life (which may include a partial
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* period). At year# i, the depreciation and remaining value are
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* computed and stored in depr[i] and remval[i]. The first year is always
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* the partial year. The results are calculated for the entire lifetime.
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*
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* SIDE EFFECTS
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* depr and remval are changed.
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*
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* RETURNS
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* depr if successful, otherwise GM_NULLARR.
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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 "gm.h"
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#include "gmsystem.h"
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DEC **DepreciateSumOfYearsTable(depr, remval, book, salv, life, partial)
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DEC **depr, **remval, *book, *salv, *partial;
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int life;
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{
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int i, plife;
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DEC drbv0, *rbv0=&drbv0, dladj, *ladj=&dladj;
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DEC ddlife, *dlife=&ddlife, dsoyd, *soyd=&dsoyd;
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DEC dtemp, *temp=&dtemp, dtemp2, *temp2=&dtemp2;
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_MacStart(GM_DPSOYTBL);
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if (!depr||!remval||!book||!salv||!partial) {
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_MacErr(GM_NULLPOINTER);
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_MacRet(GM_NULLARR);
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}
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if (_MacBad(book)||_MacBad(salv)||_MacBad(partial)) {
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_MacErr(GM_INIT);
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_MacRet(GM_NULLARR);
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}
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plife=life+(_MacIsDecZ(partial)?0:1);
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for (i=0;i<=plife;i++)
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if(!depr[i]||!remval[i]) {
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_MacErr(GM_NULLPOINTER);
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_MacRet(GM_NULLARR);
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}
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/* check life>=1, 0<=partial<=1 */
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if (life<1||_MacIsDecN(partial)||CompareDecimal(partial,&decOne)==1
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||_MacIsDecN(book)||_MacIsDecN(salv)) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULLARR);
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}
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/* calculate initial remaining book value & store zeroes indices */
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_MacDZero(depr[0]);
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(void) _SubDec80Bit(rbv0,book,salv);
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(void) _ScaleDec80Bit(rbv0, rbv0, 2);
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_MacDCopy(remval[0], rbv0);
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/* calculate sum of years digits soyd */
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(void) ConvLongToDecimal(soyd,
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(long) (life) * (long) (life+1) / 2L);
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if (_MacIsDecZ(partial)) {
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(void) ConvLongToDecimal(ladj, (long) life);
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i=0;
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}
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else {
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(void) ConvLongToDecimal(dlife, (long) life);
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/* calculate first partial year's depreciation */
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(void) _MulDec80Bit(temp, dlife, partial);
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(void) _MulDec80Bit(temp, temp, rbv0);
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(void) _DivRndDec80Bit(depr[1], temp, soyd, 2);
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/* subtract first depreciation from rbv */
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(void) _SubDec80Bit(rbv0, rbv0, depr[1]);
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_MacDCopy(remval[1],rbv0);
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i=1;
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/* calculate sum of years digits soyd */
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(void) _SubDec80Bit(ladj, dlife, partial);
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(void) _TruncateDec80Bit(temp, ladj, 0);
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(void) _SubDec80Bit(temp2, ladj, temp);
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(void) _AddDec80Bit(temp2, temp2, temp2);
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(void) _AddDec80Bit(temp2, temp2, temp);
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(void) _AddDec80Bit(temp, temp, &decOne);
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(void) _MulDec80Bit(temp, temp, temp2);
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(void) _MulDec80Bit(soyd, temp, &decPoint5);
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}
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/* handle remaining years */
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(void) _DivDec80Bit(temp, rbv0, soyd);
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while (i<plife) {
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i++;
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_MulDec80Bit(depr[i], ladj, temp);
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_ScaleDec80Bit(depr[i], depr[i], 2);
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_SubDec80Bit(ladj, ladj, &decOne);
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(void) _SubDec80Bit(remval[i], remval[i-1], depr[i]);
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}
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/* add balance to last depreciation period */
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_MacDCopy(depr[plife],remval[plife-1]);
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_MacDZero(remval[plife]);
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_MacRet(depr);
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}
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