1 /* Test file for mpfr_grandom 2 3 Copyright 2011-2016 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 http://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 <stdio.h> 24 #include <stdlib.h> 25 26 #include "mpfr-test.h" 27 28 static void 29 test_special (mpfr_prec_t p) 30 { 31 mpfr_t x; 32 int inexact; 33 34 mpfr_init2 (x, p); 35 36 inexact = mpfr_grandom (x, NULL, RANDS, MPFR_RNDN); 37 if ((inexact & 3) == 0) 38 { 39 printf ("Error: mpfr_grandom() returns a zero ternary value.\n"); 40 exit (1); 41 } 42 if ((inexact & (3 << 2)) != 0) 43 { 44 printf ("Error: the second ternary value of mpfr_grandom(x, NULL, ...)" 45 " must be 0.\n"); 46 exit (1); 47 } 48 49 mpfr_clear(x); 50 } 51 52 53 static void 54 test_grandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd, 55 int verbose) 56 { 57 mpfr_t *t; 58 mpfr_t av, va, tmp; 59 int i, inexact; 60 61 nbtests = (nbtests & 1) ? (nbtests + 1) : nbtests; 62 t = (mpfr_t *) tests_allocate (nbtests * sizeof (mpfr_t)); 63 64 for (i = 0; i < nbtests; ++i) 65 mpfr_init2 (t[i], prec); 66 67 for (i = 0; i < nbtests; i += 2) 68 { 69 inexact = mpfr_grandom (t[i], t[i + 1], RANDS, MPFR_RNDN); 70 if ((inexact & 3) == 0 || (inexact & (3 << 2)) == 0) 71 { 72 /* one call in the loop pretended to return an exact number! */ 73 printf ("Error: mpfr_grandom() returns a zero ternary value.\n"); 74 exit (1); 75 } 76 } 77 78 #ifdef HAVE_STDARG 79 if (verbose) 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 113 main (int argc, char *argv[]) 114 { 115 long nbtests; 116 int verbose; 117 tests_start_mpfr (); 118 119 verbose = 0; 120 nbtests = 10; 121 if (argc > 1) 122 { 123 long a = atol (argv[1]); 124 verbose = 1; 125 if (a != 0) 126 nbtests = a; 127 } 128 129 test_grandom (nbtests, 420, MPFR_RNDN, verbose); 130 test_special (2); 131 test_special (42000); 132 133 tests_end_mpfr (); 134 return 0; 135 } 136