1 /* Test file for mpfr_grandom
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 #define _MPFR_NO_DEPRECATED_GRANDOM
24 #include "mpfr-test.h"
25
26 static void
test_special(mpfr_prec_t p)27 test_special (mpfr_prec_t p)
28 {
29 mpfr_t x;
30 int inexact;
31
32 mpfr_init2 (x, p);
33
34 inexact = mpfr_grandom (x, NULL, RANDS, MPFR_RNDN);
35 if (((unsigned int) inexact & 3) == 0)
36 {
37 printf ("Error: mpfr_grandom() returns a zero ternary value.\n");
38 exit (1);
39 }
40 if (((unsigned int) inexact & (3 << 2)) != 0)
41 {
42 printf ("Error: the second ternary value of mpfr_grandom(x, NULL, ...)"
43 " must be 0.\n");
44 exit (1);
45 }
46
47 mpfr_clear (x);
48 }
49
50
51 static void
test_grandom(long nbtests,mpfr_prec_t prec,mpfr_rnd_t rnd,int verbose)52 test_grandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd,
53 int verbose)
54 {
55 mpfr_t *t;
56 int i, inexact;
57
58 nbtests = (nbtests & 1) ? (nbtests + 1) : nbtests;
59 t = (mpfr_t *) tests_allocate (nbtests * sizeof (mpfr_t));
60
61 for (i = 0; i < nbtests; ++i)
62 mpfr_init2 (t[i], prec);
63
64 for (i = 0; i < nbtests; i += 2)
65 {
66 inexact = mpfr_grandom (t[i], t[i + 1], RANDS, MPFR_RNDN);
67 if (((unsigned int) inexact & 3) == 0 ||
68 ((unsigned int) inexact & (3 << 2)) == 0)
69 {
70 /* one call in the loop pretended to return an exact number! */
71 printf ("Error: mpfr_grandom() returns a zero ternary value.\n");
72 exit (1);
73 }
74 }
75
76 #if defined(HAVE_STDARG) && !defined(MPFR_USE_MINI_GMP)
77 if (verbose)
78 {
79 mpfr_t av, va, tmp;
80
81 mpfr_init2 (av, prec);
82 mpfr_init2 (va, prec);
83 mpfr_init2 (tmp, prec);
84
85 mpfr_set_ui (av, 0, MPFR_RNDN);
86 mpfr_set_ui (va, 0, MPFR_RNDN);
87 for (i = 0; i < nbtests; ++i)
88 {
89 mpfr_add (av, av, t[i], MPFR_RNDN);
90 mpfr_sqr (tmp, t[i], MPFR_RNDN);
91 mpfr_add (va, va, tmp, MPFR_RNDN);
92 }
93 mpfr_div_ui (av, av, nbtests, MPFR_RNDN);
94 mpfr_div_ui (va, va, nbtests, MPFR_RNDN);
95 mpfr_sqr (tmp, av, MPFR_RNDN);
96 mpfr_sub (va, va, av, MPFR_RNDN);
97
98 mpfr_printf ("Average = %.5Rf\nVariance = %.5Rf\n", av, va);
99 mpfr_clear (av);
100 mpfr_clear (va);
101 mpfr_clear (tmp);
102 }
103 #endif /* HAVE_STDARG */
104
105 for (i = 0; i < nbtests; ++i)
106 mpfr_clear (t[i]);
107 tests_free (t, nbtests * sizeof (mpfr_t));
108 return;
109 }
110
111
112 int
main(int argc,char * argv[])113 main (int argc, char *argv[])
114 {
115 long nbtests;
116 int verbose;
117 int i;
118
119 tests_start_mpfr ();
120
121 verbose = 0;
122 nbtests = 10;
123 if (argc > 1)
124 {
125 long a = atol (argv[1]);
126 verbose = 1;
127 if (a != 0)
128 nbtests = a;
129 }
130
131 test_grandom (nbtests, 420, MPFR_RNDN, verbose);
132 test_special (2);
133 test_special (42000);
134 /* the following should exercise the case "Extend by 32 bits" in grandom.c */
135 for (i = 0; i < 10000; i++)
136 test_special (1);
137
138 tests_end_mpfr ();
139 return 0;
140 }
141