77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/* Test mpz_get_d.
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Copyright 2002 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 "gmp-impl.h"
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#include "tests.h"
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void
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check_onebit (void)
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{
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int i;
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mpz_t z;
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double got, want;
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/* FIXME: It'd be better to base this on the float format. */
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#ifdef __vax
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int limit = 127; /* vax fp numbers have limited range */
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#else
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int limit = 512;
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#endif
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mpz_init (z);
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mpz_set_ui (z, 1L);
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want = 1.0;
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for (i = 0; i < limit; i++)
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{
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got = mpz_get_d (z);
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if (got != want)
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{
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printf ("mpz_get_d wrong on 2**%d\n", i);
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mpz_trace (" z ", z);
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printf (" want %.20g\n", want);
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printf (" got %.20g\n", got);
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abort();
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}
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mpz_mul_2exp (z, z, 1L);
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want *= 2.0;
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}
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mpz_clear (z);
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}
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int
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main (void)
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{
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tests_start ();
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check_onebit ();
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tests_end ();
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exit (0);
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}
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