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/* Test file for mpfr_grandom
Copyright 2011-2021 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. */
#define _MPFR_NO_DEPRECATED_GRANDOM
#include "mpfr-test.h"
static void
test_special (mpfr_prec_t p)
{
mpfr_t x;
int inexact;
mpfr_init2 (x, p);
inexact = mpfr_grandom (x, NULL, RANDS, MPFR_RNDN);
if (((unsigned int) inexact & 3) == 0)
{
printf ("Error: mpfr_grandom() returns a zero ternary value.\n");
exit (1);
}
if (((unsigned int) inexact & (3 << 2)) != 0)
{
printf ("Error: the second ternary value of mpfr_grandom(x, NULL, ...)"
" must be 0.\n");
exit (1);
}
mpfr_clear (x);
}
static void
test_grandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd,
int verbose)
{
mpfr_t *t;
int i, inexact;
nbtests = (nbtests & 1) ? (nbtests + 1) : nbtests;
t = (mpfr_t *) tests_allocate (nbtests * sizeof (mpfr_t));
for (i = 0; i < nbtests; ++i)
mpfr_init2 (t[i], prec);
for (i = 0; i < nbtests; i += 2)
{
inexact = mpfr_grandom (t[i], t[i + 1], RANDS, MPFR_RNDN);
if (((unsigned int) inexact & 3) == 0 ||
((unsigned int) inexact & (3 << 2)) == 0)
{
/* one call in the loop pretended to return an exact number! */
printf ("Error: mpfr_grandom() returns a zero ternary value.\n");
exit (1);
}
}
#if defined(HAVE_STDARG) && !defined(MPFR_USE_MINI_GMP)
if (verbose)
{
mpfr_t av, va, tmp;
mpfr_init2 (av, prec);
mpfr_init2 (va, prec);
mpfr_init2 (tmp, prec);
mpfr_set_ui (av, 0, MPFR_RNDN);
mpfr_set_ui (va, 0, MPFR_RNDN);
for (i = 0; i < nbtests; ++i)
{
mpfr_add (av, av, t[i], MPFR_RNDN);
mpfr_sqr (tmp, t[i], MPFR_RNDN);
mpfr_add (va, va, tmp, MPFR_RNDN);
}
mpfr_div_ui (av, av, nbtests, MPFR_RNDN);
mpfr_div_ui (va, va, nbtests, MPFR_RNDN);
mpfr_sqr (tmp, av, MPFR_RNDN);
mpfr_sub (va, va, av, MPFR_RNDN);
mpfr_printf ("Average = %.5Rf\nVariance = %.5Rf\n", av, va);
mpfr_clear (av);
mpfr_clear (va);
mpfr_clear (tmp);
}
#endif /* HAVE_STDARG */
for (i = 0; i < nbtests; ++i)
mpfr_clear (t[i]);
tests_free (t, nbtests * sizeof (mpfr_t));
return;
}
int
main (int argc, char *argv[])
{
long nbtests;
int verbose;
int i;
tests_start_mpfr ();
verbose = 0;
nbtests = 10;
if (argc > 1)
{
long a = atol (argv[1]);
verbose = 1;
if (a != 0)
nbtests = a;
}
test_grandom (nbtests, 420, MPFR_RNDN, verbose);
test_special (2);
test_special (42000);
/* the following should exercise the case "Extend by 32 bits" in grandom.c */
for (i = 0; i < 10000; i++)
test_special (1);
tests_end_mpfr ();
return 0;
}
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