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/* Test file for mpfr_eq.
Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
static void
teq (mpfr_t x)
{
mpfr_t y;
long k, px, mx;
mpfr_init2(y, MPFR_PREC(x));
mx = (MPFR_PREC(x) - 1)/mp_bits_per_limb;
px = mp_bits_per_limb - 2;
for (k = 2; k < MPFR_PREC(x); k++)
{
mpfr_set(y, x, GMP_RNDN);
MPFR_MANT(y) [mx] ^= (mp_limb_t) 1 << px;
if (mpfr_eq(y, x, k) ||
!mpfr_eq(y, x, k - 1))
{
printf ("Error in eq.\n");
printf ("x = "); mpfr_print_binary (x); printf ("\n");
printf ("y = "); mpfr_print_binary (y); printf ("\n");
printf ("k = %ld\n", k);
printf ("mpfr_eq(y, x, k) = %d\nmpfr_eq(y, x, k - 1) = %d\n",
mpfr_eq (y, x, k), mpfr_eq (y, x, k - 1));
mpfr_clear (x); mpfr_clear (y);
exit (1);
}
if (px)
{
--px;
}
else
{
--mx;
px = mp_bits_per_limb - 1;
}
}
mpfr_clear(y);
}
static void
special (void)
{
mpfr_t x, y, z;
int i, error = 0;
mpfr_init2 (x, 53);
mpfr_init2 (y, 53);
mpfr_init2 (z, 53);
mpfr_set_str (x, "1", 10, 0);
mpfr_set_str (y, "1e-10000", 10, 0);
mpfr_add (z, x, y, GMP_RNDU);
for (i = 1; i <= 52; i++)
if (mpfr_eq (x, z, i) == 0)
error = 1;
for (i = 53; i <= 100; i++)
if (mpfr_eq (x, z, i) != 0)
error = 1;
if (mpfr_eq (x, z, 1000) != 0)
error = 1;
if (error)
{
printf ("Error in mpfr_eq (1, 1+1e-1000)\n");
exit (1);
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
}
int
main (void)
{
int j; mpfr_t x;
tests_start_mpfr ();
special ();
mpfr_init2 (x, 1000);
for (j=0;j<1000;j++) {
mpfr_random (x);
teq (x);
}
mpfr_clear (x);
tests_end_mpfr ();
return 0;
}
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