1 /* Test file for mpfr_erandom
2
3 Copyright 2011-2023 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramba projects, INRIA.
5
6 This file is part of the GNU MPFR Library.
7
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
12
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 #include "mpfr-test.h"
24
25 static void
test_special(mpfr_prec_t p)26 test_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
44 static void
test_erandom(long nbtests,mpfr_prec_t prec,mpfr_rnd_t rnd,int verbose)45 test_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
103 int
main(int argc,char * argv[])104 main (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