77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
|
/* Test mpz_get_d.
|
||
|
|
|
||
|
|
Copyright 2002 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This file is part of the GNU MP Library.
|
||
|
|
|
||
|
|
The GNU MP 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 GNU MP 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 GNU MP Library; see the file COPYING.LIB. If not, write to
|
||
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
||
|
|
MA 02110-1301, USA. */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include "gmp.h"
|
||
|
|
#include "gmp-impl.h"
|
||
|
|
#include "tests.h"
|
||
|
|
|
||
|
|
|
||
|
|
void
|
||
|
|
check_onebit (void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
mpz_t z;
|
||
|
|
double got, want;
|
||
|
|
/* FIXME: It'd be better to base this on the float format. */
|
||
|
|
#ifdef __vax
|
||
|
|
int limit = 127; /* vax fp numbers have limited range */
|
||
|
|
#else
|
||
|
|
int limit = 512;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
mpz_init (z);
|
||
|
|
|
||
|
|
mpz_set_ui (z, 1L);
|
||
|
|
want = 1.0;
|
||
|
|
|
||
|
|
for (i = 0; i < limit; i++)
|
||
|
|
{
|
||
|
|
got = mpz_get_d (z);
|
||
|
|
|
||
|
|
if (got != want)
|
||
|
|
{
|
||
|
|
printf ("mpz_get_d wrong on 2**%d\n", i);
|
||
|
|
mpz_trace (" z ", z);
|
||
|
|
printf (" want %.20g\n", want);
|
||
|
|
printf (" got %.20g\n", got);
|
||
|
|
abort();
|
||
|
|
}
|
||
|
|
|
||
|
|
mpz_mul_2exp (z, z, 1L);
|
||
|
|
want *= 2.0;
|
||
|
|
}
|
||
|
|
mpz_clear (z);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int
|
||
|
|
main (void)
|
||
|
|
{
|
||
|
|
tests_start ();
|
||
|
|
|
||
|
|
check_onebit ();
|
||
|
|
|
||
|
|
tests_end ();
|
||
|
|
exit (0);
|
||
|
|
}
|