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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* nearzero.c: bcmath library file. */
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/*
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Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
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Copyright (C) 2000 Philip A. Nelson
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details. (COPYING.LIB)
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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Boston, MA 02111-1307 USA.
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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#include <config.h>
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include "bcmath.h"
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#include "private.h"
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/* In some places we need to check if the number NUM is almost zero.
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Specifically, all but the last digit is 0 and the last digit is 1.
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Last digit is defined by scale. */
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char
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bc_is_near_zero (num, scale)
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bc_num num;
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int scale;
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{
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int count;
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char *nptr;
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/* Error checking */
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if (scale > num->n_scale)
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scale = num->n_scale;
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/* Initialize */
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count = num->n_len + scale;
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nptr = num->n_value;
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/* The check */
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while ((count > 0) && (*nptr++ == 0)) count--;
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if (count != 0 && (count != 1 || *--nptr != 1))
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return FALSE;
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else
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return TRUE;
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}
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