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
      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
      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
     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  }