added tests files for mpfr_nrandom and mpfr_erandom

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@8553 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 130 insertions, 0 deletions

diff --git a/tests/tnrandom.c b/tests/tnrandom.c
new file mode 100644
index 000000000..f8200afd4
--- /dev/null
+++ b/tests/tnrandom.c
@@ -0,0 +1,130 @@
+/* Test file for mpfr_nrandom
+
+Copyright 2011-2013 Free Software Foundation, Inc.
+Contributed by the AriC and Caramel projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include "mpfr-test.h"
+
+static void
+test_special (mpfr_prec_t p)
+{
+  mpfr_t x;
+  int inexact;
+
+  mpfr_init2 (x, p);
+
+  inexact = mpfr_nrandom (x, RANDS, MPFR_RNDN);
+  if (inexact == 0)
+    {
+      printf ("Error: mpfr_nrandom() returns a zero ternary value.\n");
+      exit (1);
+    }
+
+  mpfr_clear(x);
+}
+
+
+static void
+test_nrandom (long nbtests, mpfr_prec_t prec, mpfr_rnd_t rnd,
+              int verbose)
+{
+  mpfr_t *t;
+  mpfr_t av, va, tmp;
+  int i, inexact;
+
+  t = (mpfr_t *) malloc (nbtests * sizeof (mpfr_t));
+  if (t == NULL)
+    {
+      fprintf (stderr, "tnrandom: can't allocate memory in test_nrandom\n");
+      exit (1);
+    }
+
+  for (i = 0; i < nbtests; ++i)
+    mpfr_init2 (t[i], prec);
+
+  for (i = 0; i < nbtests; i++)
+    {
+      inexact = mpfr_nrandom (t[i], RANDS, MPFR_RNDN);
+      if (inexact == 0)
+        {
+          /* one call in the loop pretended to return an exact number! */
+          printf ("Error: mpfr_nrandom() returns a zero ternary value.\n");
+          exit (1);
+        }
+    }
+
+#ifdef HAVE_STDARG
+  if (verbose)
+    {
+      mpfr_init2 (av, prec);
+      mpfr_init2 (va, prec);
+      mpfr_init2 (tmp, prec);
+
+      mpfr_set_ui (av, 0, MPFR_RNDN);
+      mpfr_set_ui (va, 0, MPFR_RNDN);
+      for (i = 0; i < nbtests; ++i)
+        {
+          mpfr_add (av, av, t[i], MPFR_RNDN);
+          mpfr_sqr (tmp, t[i], MPFR_RNDN);
+          mpfr_add (va, va, tmp, MPFR_RNDN);
+        }
+      mpfr_div_ui (av, av, nbtests, MPFR_RNDN);
+      mpfr_div_ui (va, va, nbtests, MPFR_RNDN);
+      mpfr_sqr (tmp, av, MPFR_RNDN);
+      mpfr_sub (va, va, av, MPFR_RNDN);
+
+      mpfr_printf ("Average = %.5Rf\nVariance = %.5Rf\n", av, va);
+      mpfr_clear (av);
+      mpfr_clear (va);
+      mpfr_clear (tmp);
+    }
+#endif /* HAVE_STDARG */
+
+  for (i = 0; i < nbtests; ++i)
+    mpfr_clear (t[i]);
+  free (t);
+  return;
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  long nbtests;
+  int verbose;
+  tests_start_mpfr ();
+
+  verbose = 0;
+  nbtests = 10;
+  if (argc > 1)
+    {
+      long a = atol (argv[1]);
+      verbose = 1;
+      if (a != 0)
+        nbtests = a;
+    }
+
+  test_nrandom (nbtests, 420, MPFR_RNDN, verbose);
+  test_special (2);
+  test_special (42000);
+
+  tests_end_mpfr ();
+  return 0;
+}