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/* Test file for mpfr_get_q.
Copyright 2017-2020 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU 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 3 of the License, or (at your
option) any later version.
The GNU 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 GNU MPFR Library; see the file COPYING.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-test.h"
#ifndef MPFR_USE_MINI_GMP
static void
special (void)
{
mpfr_t f;
mpq_t q;
mpfr_init2 (f, MPFR_PREC_MIN);
mpq_init (q);
/* check NaN */
mpfr_set_nan (f);
mpfr_clear_erangeflag ();
mpfr_get_q (q, f);
MPFR_ASSERTN(mpq_cmp_ui (q, 0, 1) == 0);
MPFR_ASSERTN(mpfr_erangeflag_p ());
/* check +Inf */
mpfr_set_inf (f, 1);
mpfr_clear_erangeflag ();
mpfr_get_q (q, f);
MPFR_ASSERTN(mpq_cmp_ui (q, 0, 1) == 0);
MPFR_ASSERTN(mpfr_erangeflag_p ());
/* check -Inf */
mpfr_set_inf (f, -1);
mpfr_clear_erangeflag ();
mpfr_get_q (q, f);
MPFR_ASSERTN(mpq_cmp_ui (q, 0, 1) == 0);
MPFR_ASSERTN(mpfr_erangeflag_p ());
/* check +0 */
mpfr_set_zero (f, 1);
mpfr_clear_erangeflag ();
mpfr_get_q (q, f);
MPFR_ASSERTN(mpq_cmp_ui (q, 0, 1) == 0);
MPFR_ASSERTN(!mpfr_erangeflag_p ());
/* check -0 */
mpfr_set_zero (f, -1);
mpfr_clear_erangeflag ();
mpfr_get_q (q, f);
MPFR_ASSERTN(mpq_cmp_ui (q, 0, 1) == 0);
MPFR_ASSERTN(!mpfr_erangeflag_p ());
mpq_clear (q);
mpfr_clear (f);
}
static void
random_tests (void)
{
mpfr_t f, g;
mpq_t q;
int inex;
mpfr_rnd_t rnd;
int i;
mpfr_init2 (f, MPFR_PREC_MIN + (randlimb() % 100));
mpfr_init2 (g, mpfr_get_prec (f));
mpq_init (q);
for (i = 0; i < 1000; i++)
{
mpfr_urandomb (f, RANDS);
mpfr_get_q (q, f);
rnd = RND_RAND ();
inex = mpfr_set_q (g, q, rnd);
MPFR_ASSERTN(inex == 0);
MPFR_ASSERTN(mpfr_cmp (f, g) == 0);
}
mpq_clear (q);
mpfr_clear (f);
mpfr_clear (g);
}
/* Check results are in canonical form.
See https://sympa.inria.fr/sympa/arc/mpfr/2017-12/msg00029.html */
static void
check_canonical (void)
{
mpfr_t x;
mpq_t q;
mpz_t z;
mpfr_init2 (x, 53);
mpfr_set_ui (x, 3, MPFR_RNDN);
mpq_init (q);
mpfr_get_q (q, x);
/* check the denominator is positive */
if (mpz_sgn (mpq_denref (q)) <= 0)
{
printf ("Error, the denominator of mpfr_get_q should be positive\n");
exit (1);
}
mpz_init (z);
mpz_gcd (z, mpq_numref (q), mpq_denref (q));
/* check the numerator and denominator are coprime */
if (mpz_cmp_ui (z, 1) != 0)
{
printf ("Error, numerator and denominator of mpfr_get_q should be coprime\n");
exit (1);
}
mpfr_clear (x);
mpq_clear (q);
mpz_clear (z);
}
static void
coverage (void)
{
mpfr_t x;
mpq_t q;
mpz_t z;
mpfr_init2 (x, 5);
mpq_init (q);
mpz_init (z);
mpfr_set_ui_2exp (x, 17, 100, MPFR_RNDN);
mpfr_get_q (q, x);
MPFR_ASSERTN(mpz_cmp_ui (mpq_denref (q), 1) == 0);
mpz_set_ui (z, 17);
mpz_mul_2exp (z, z, 100);
MPFR_ASSERTN(mpz_cmp (mpq_numref (q), z) == 0);
mpfr_clear (x);
mpq_clear (q);
mpz_clear (z);
}
int
main (void)
{
tests_start_mpfr ();
coverage ();
special ();
random_tests ();
check_canonical ();
tests_end_mpfr ();
return 0;
}
#else
int
main (void)
{
return 77;
}
#endif /* MPFR_USE_MINI_GMP */
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