1/* Test file for mpfr_erandom
2
3Copyright 2011-2023 Free Software Foundation, Inc.
4Contributed by the AriC and Caramba projects, INRIA.
5
6This file is part of the GNU MPFR Library.
7
8The GNU MPFR Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MPFR Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
20https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23#include "mpfr-test.h"
24
25static void
26test_special (mpfr_prec_t p)
27{
28  mpfr_t x;
29  int inexact;
30
31  mpfr_init2 (x, p);
32
33  inexact = mpfr_erandom (x, RANDS, MPFR_RNDN);
34  if (inexact == 0)
35    {
36      printf ("Error: mpfr_erandom() returns a zero ternary value.\n");
37      exit (1);
38    }
39
40  mpfr_clear(x);
41}
42
43
44static void
45test_erandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd,
46              int verbose)
47{
48  mpfr_t *t;
49  int i, inexact;
50
51  t = (mpfr_t *) tests_allocate (nbtests * sizeof (mpfr_t));
52
53  for (i = 0; i < nbtests; ++i)
54    mpfr_init2 (t[i], prec);
55
56  for (i = 0; i < nbtests; i++)
57    {
58      inexact = mpfr_erandom (t[i], RANDS, MPFR_RNDN);
59      if (inexact == 0)
60        {
61          /* one call in the loop pretended to return an exact number! */
62          printf ("Error: mpfr_erandom() returns a zero ternary value.\n");
63          exit (1);
64        }
65    }
66
67#if defined(HAVE_STDARG) && !defined(MPFR_USE_MINI_GMP)
68  if (verbose)
69    {
70      mpfr_t av, va, tmp;
71
72      mpfr_init2 (av, prec);
73      mpfr_init2 (va, prec);
74      mpfr_init2 (tmp, prec);
75
76      mpfr_set_ui (av, 0, MPFR_RNDN);
77      mpfr_set_ui (va, 0, MPFR_RNDN);
78      for (i = 0; i < nbtests; ++i)
79        {
80          mpfr_add (av, av, t[i], MPFR_RNDN);
81          mpfr_sqr (tmp, t[i], MPFR_RNDN);
82          mpfr_add (va, va, tmp, MPFR_RNDN);
83        }
84      mpfr_div_ui (av, av, nbtests, MPFR_RNDN);
85      mpfr_div_ui (va, va, nbtests, MPFR_RNDN);
86      mpfr_sqr (tmp, av, MPFR_RNDN);
87      mpfr_sub (va, va, av, MPFR_RNDN);
88
89      mpfr_printf ("Average = %.5Rf\nVariance = %.5Rf\n", av, va);
90      mpfr_clear (av);
91      mpfr_clear (va);
92      mpfr_clear (tmp);
93    }
94#endif /* HAVE_STDARG */
95
96  for (i = 0; i < nbtests; ++i)
97    mpfr_clear (t[i]);
98  tests_free (t, nbtests * sizeof (mpfr_t));
99  return;
100}
101
102
103int
104main (int argc, char *argv[])
105{
106  long nbtests;
107  int verbose;
108
109  tests_start_mpfr ();
110
111  verbose = 0;
112  nbtests = 10;
113  if (argc > 1)
114    {
115      long a = atol (argv[1]);
116      verbose = 1;
117      if (a != 0)
118        nbtests = a;
119    }
120
121  test_erandom (nbtests, 420, MPFR_RNDN, verbose);
122  test_special (2);
123  test_special (42000);
124
125  tests_end_mpfr ();
126  return 0;
127}
128