1b14ec9415
git-svn-id: svn://10.65.10.50/branches/R_10_00@23236 c028cbd2-c16b-5b4b-a496-9718f37d4682
79 lines
1.5 KiB
C
Executable File
79 lines
1.5 KiB
C
Executable File
/* DEC *UniformSeriesPresentValue(dst, intr, nper);
|
|
*
|
|
* ARGUMENT
|
|
* DEC *dst,*intr;
|
|
* int nper;
|
|
*
|
|
* DESCRIPTION
|
|
* Calculates the present value of a uniform series of nper payments
|
|
* of 1 dollar at the percentage interest rate of intr.
|
|
* dst = [ 1 - (1 + intr / 100) ^ -nper ] / (intr / 100) if intr != 0
|
|
* dst = n if intr == 0
|
|
*
|
|
* SIDE EFFECTS
|
|
* The result is stored in dst.
|
|
*
|
|
* RETURNS
|
|
* dst if successful, otherwise GM_NULL.
|
|
*
|
|
* POSSIBLE ERRORS
|
|
* GM_NULLPOINTER
|
|
* GM_ARGVAL
|
|
*
|
|
* AUTHOR
|
|
* Jared Levy
|
|
* Copyright (C) 1988-1990 Greenleaf Software Inc. All rights reserved.
|
|
*
|
|
* MODIFICATIONS
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "gmsystem.h"
|
|
DEC *UniformSeriesPresentValue(dst, intr, nper)
|
|
DEC *dst,*intr;
|
|
int nper;
|
|
{
|
|
DEC dtemp, *temp=&dtemp, dnintr, *nintr=&dnintr;
|
|
int i;
|
|
|
|
_MacStart(GM_USPV);
|
|
|
|
_MacInVarD(intr);
|
|
_MacOutVarD(dst);
|
|
|
|
/* interest rate must be greater than -100% */
|
|
if (CompareDecimal(intr,&decMinusHundred)<=0) {
|
|
_MacErr(GM_ARGVAL);
|
|
_MacRet(GM_NULL);
|
|
}
|
|
|
|
if (_MacIsDecZ(intr)) {
|
|
ConvLongToDecimal(dst, (long) nper);
|
|
_MacRet(dst);
|
|
}
|
|
|
|
_MacDCopy(nintr, intr);
|
|
nintr->dc.id +=2;
|
|
(void) _AddDec80Bit(temp, nintr, &decOne);
|
|
i = _IntPwrDec80Bit(temp, temp, -nper);
|
|
|
|
if (i==GM_OVERFLOW) {
|
|
_MacErr(GM_ARGVAL);
|
|
_MacRet(GM_NULL);
|
|
}
|
|
|
|
(void) _SubDec80Bit(temp, &decOne, temp);
|
|
(void) _DivDec80Bit(temp, temp, nintr);
|
|
|
|
if (_Sq5UnsTo4Uns(temp)!=GM_SUCCESS) {
|
|
_MacErr(GM_ARGVAL);
|
|
_MacRet(GM_NULL);
|
|
}
|
|
|
|
_MacDCopy(dst, temp);
|
|
|
|
_MacRet(temp);
|
|
}
|