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/* Test file for mpfr_nrandom
Copyright 2011-2025 Free Software Foundation, Inc.
Contributed by the Pascaline 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/>. */
#include "mpfr-test.h"
static void
test_special (mpfr_prec_t p)
{
mpfr_t x;
int inexact;
mpfr_init2 (x, p);
inexact = mpfr_nrandom (x, RANDS, MPFR_RNDN);
if (inexact == 0)
{
printf ("Error: mpfr_nrandom() returns a zero ternary value.\n");
exit (1);
}
mpfr_clear (x);
}
#define NRES 10
static const char *res[NRES] = {
"-2.07609e2d96da78b2d6bea3ab30d4359222a82f8a35e4e4464303ad4808f57458@0",
"1.a4650a963ab9f266ed009ee96c8788f6b88212f5f2a4d4aef65db2a9e57c44bc@-1",
"c.0b3cda7f370a36febed972dbb47f2503f7e08a651edbf12d0303d968257841b0@-1",
"-7.4dffd19868c4bc2ec5b6c8311e0f190e1c97b575b7fdabec897e5de2a1d802b8@-1",
"1.40f6204ded71a4346ed17094863347b8c735e62712cc0b4d0c5402ee310d9714@0",
"-3.09fd2a1fc234e23bfa048dbf1e7850ac6cbea2514a0f3ce011e964d9f331cbcc@-1",
"-1.104e769aadb5fce5a7ad1c546e91b889829a76920c7cc7ac4cbd12009451ce90@0",
"3.0a08181e342b02187463c0025f895b41ddb7076c5bf157e3b898e9248baf4ad4@-1",
"-d.44fda7a51276b722ebc88dd016b7d9d7ea5ba682282a42cdef6948312e5dcf70@-1",
"1.5bf69aff31bb3e6430cc263fdd45ef2c70a779984e764524bc35a9cb4a430dd0@0" };
/* If checkval is true, check the obtained results by using a fixed seed
for reproducibility. */
static void
test_nrandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd,
int verbose, int checkval)
{
gmp_randstate_t s;
mpfr_t *t;
int i, inexact;
if (checkval)
{
gmp_randinit_default (s);
gmp_randseed_ui (s, 17);
nbtests = NRES;
}
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++)
{
inexact = mpfr_nrandom (t[i], checkval ? s : RANDS, MPFR_RNDN);
if (checkval && mpfr_cmp_str (t[i], res[i], 16, MPFR_RNDN) != 0)
{
printf ("Unexpected value in test_nrandom().\n"
"Expected %s\n"
"Got ", res[i]);
mpfr_out_str (stdout, 16, 0, t[i], MPFR_RNDN);
printf ("\n");
exit (1);
}
if (inexact == 0)
{
/* one call in the loop pretended to return an exact number! */
printf ("Error: mpfr_nrandom() 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));
if (checkval)
gmp_randclear (s);
return;
}
int
main (int argc, char *argv[])
{
long nbtests;
int verbose;
tests_start_mpfr ();
verbose = 0;
nbtests = 10;
if (argc > 1)
{
/* Number of values in argument. Note that the mpfr_clear loop above
is in O(n^2) until the FIXME for tests_memory_find() in memory.c
is resolved (the search in tests_memory_find() is in O(n), while
it could be in almost constant time). */
long a = atol (argv[1]);
verbose = 1;
if (a != 0)
nbtests = a;
}
test_nrandom (nbtests, 420, MPFR_RNDN, verbose, 0);
#ifndef MPFR_USE_MINI_GMP
/* The random generator in mini-gmp is not deterministic. */
test_nrandom (0, 256, MPFR_RNDN, 0, 1);
#endif /* MPFR_USE_MINI_GMP */
test_special (2);
test_special (42000);
tests_end_mpfr ();
return 0;
}
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