77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
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/* Test mpf_get_d and mpf_set_d.
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Copyright 1996, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp.h"
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#include "tests.h"
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#if defined (__vax__)
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#define LOW_BOUND 1e-38
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#define HIGH_BOUND 8e37
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#endif
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#if defined (_CRAY) && ! defined (_CRAYIEEE)
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/* The range varies mysteriously between Cray version. On an SV1,
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the range seem to be 1e-600..1e603, but a cfp (non-ieee) T90
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has a much smaller range of 1e-240..1e240. */
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#define LOW_BOUND 1e-240
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#define HIGH_BOUND 1e240
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#endif
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#if ! defined (LOW_BOUND)
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#define LOW_BOUND 1e-300
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#define HIGH_BOUND 1e300
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#endif
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int
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main (int argc, char **argv)
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{
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double d, e, r;
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mpf_t u, v;
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tests_start ();
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mpf_init (u);
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mpf_init (v);
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mpf_set_d (u, LOW_BOUND);
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for (d = 2.0 * LOW_BOUND; d < HIGH_BOUND; d *= 1.01)
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{
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mpf_set_d (v, d);
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if (mpf_cmp (u, v) >= 0)
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abort ();
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e = mpf_get_d (v);
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r = e/d;
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if (r < 0.99999999999999 || r > 1.00000000000001)
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{
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fprintf (stderr, "should be one ulp from 1: %.16f\n", r);
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abort ();
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}
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mpf_set (u, v);
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}
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mpf_clear (u);
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mpf_clear (v);
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tests_end ();
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exit (0);
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}
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