68 lines
1.0 KiB
C
68 lines
1.0 KiB
C
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/* DEC *ConvFractionToDecimal( x, i, n, d)
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*
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* ARGUMENT
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* DEC *x; output
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* long i; integer part
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* int n; numerator
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* int d; denominator
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*
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* DESCRIPTION
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* Sets x equal to the fraction i + n/d.
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*
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* SIDE EFFECTS
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* x is indeterminate on error.
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*
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* RETURNS
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* The DEC if the conversion is successful, and GM_NULL otherwise.
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*
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* POSSIBLE ERROR CODES
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* GM_NULLPOINTER
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* GM_DIV0
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*
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* AUTHOR
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* Jared Levy Oct. 10, 1989
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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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#include <stdio.h>
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#include "gmsystem.h"
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DEC *ConvFractionToDecimal( x, i, n, d)
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DEC *x;
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long i;
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int n;
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int d;
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{
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int isneg=0;
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_MacStart(GM_FRTOD);
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_MacOutVarD(x);
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/* check for 0 denominator */
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if (!d) {
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_MacErr(GM_DIV0);
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_MacRet(GM_NULL);
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}
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/* handle negative numbers */
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if (i<0) {
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isneg = 1;
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i = -i;
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n = (n<0) ? -n : n;
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d = (d<0) ? -d : d;
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}
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ConvLongToDecimal(x, (long) n);
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DivideDecimalByLong(x, x, (long) d);
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AddLongToDecimal(x, x, i);
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DeleteTrailingZeroes(x, x);
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x->dc.attr = isneg;
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_MacRet(x);
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}
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