glib/tsrc/BC/tests/rand-test.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 16:46:38 +0300
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permissions -rw-r--r--
Revision: 201011 Kit: 201015
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/* Portion Copyright © 2008-09 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.*/
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#undef G_DISABLE_ASSERT
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#undef G_LOG_DOMAIN
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#include <glib.h>
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#include <stdio.h>
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#include <unistd.h>
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#ifdef SYMBIAN
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#include "mrt2_glib2_test.h"
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#endif /*SYMBIAN*/
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/* Outputs tested against the reference implementation mt19937ar.c from
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   http://www.math.keio.ac.jp/~matumoto/MT2002/emt19937ar.html */
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/* Tests for a simple seed, first number is the seed */
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const guint32 first_numbers[] = 
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{
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};
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/* array seed */
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const guint32 seed_array[] =
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{
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  0xd6b8d43b,
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  0x2b10117c
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};
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/* tests for the array seed */
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const guint32 array_outputs[] =
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{
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  0xc22b7dc3,
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  0x10e736ae
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};
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const gint length = sizeof (first_numbers) / sizeof (first_numbers[0]);
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const gint seed_length = sizeof (seed_array) / sizeof (seed_array[0]);
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const gint array_length = sizeof (array_outputs) / sizeof (array_outputs[0]);
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int main()
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{
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  guint n;
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  guint ones;
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  double proportion;
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  GRand* rand;// = g_rand_new_with_seed (first_numbers[0]);
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  GRand* copy;
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  #ifdef SYMBIAN
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  g_log_set_handler (NULL,  G_LOG_FLAG_FATAL| G_LOG_FLAG_RECURSION | G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING | G_LOG_LEVEL_MESSAGE | G_LOG_LEVEL_INFO | G_LOG_LEVEL_DEBUG, &mrtLogHandler, NULL);
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  g_set_print_handler(mrtPrintHandler);
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  #endif /*SYMBIAN*/
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  rand = g_rand_new_with_seed (first_numbers[0]);
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  for (n = 1; n < length; n++)
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    g_assert (first_numbers[n] == g_rand_int (rand));
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  g_rand_set_seed (rand, 2);
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  g_rand_set_seed_array (rand, seed_array, seed_length);
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  for (n = 0; n < array_length; n++)
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    g_assert (array_outputs[n] == g_rand_int (rand));
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  copy = g_rand_copy (rand);
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  for (n = 0; n < 100; n++)
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    g_assert (g_rand_int (copy) == g_rand_int (rand));
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 // for (n = 1; n < 100000; n++)
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  for (n = 1; n < 100000; n++)
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    {
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      gint32 i;
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      gdouble d;
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      gboolean b;
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      i = g_rand_int_range (rand, 8,16);
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      g_assert (i >= 8 && i < 16);
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      i = g_random_int_range (8,16);
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      g_assert (i >= 8 && i < 16);
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      d = g_rand_double (rand);
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      g_assert (d >= 0 && d < 1);
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      d = g_random_double ();
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      g_assert (d >= 0 && d < 1);
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      d = g_rand_double_range (rand, -8, 32);
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      g_assert (d >= -8 && d < 32);
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      d = g_random_double_range (-8, 32);
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      g_assert (d >= -8 && d < 32);
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      b = g_random_boolean ();
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      g_assert (b == TRUE || b  == FALSE);
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      b = g_rand_boolean (rand);
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      g_assert (b == TRUE || b  == FALSE);     
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    }
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  /* Statistical sanity check, count the number of ones
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   * when getting random numbers in range [0,3) and see
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   * that it must be semi-close to 0.25 with a VERY large
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   * probability */
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  ones = 0;
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  for (n = 1; n < 100000; n++)
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    {
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      if (g_random_int_range (0, 4) == 1)
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        ones ++;
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    }
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  proportion = (double)ones / (double)100000;
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  /* 0.025 is overkill, but should suffice to test for some unreasonability */
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  g_assert (ABS (proportion - 0.25) < 0.025);
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  g_rand_free (rand);
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  g_rand_free (copy);
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#ifdef SYMBIAN
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  testResultXml("rand-test");
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#endif /* EMULATOR */
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  return 0;
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}
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