Blame stdlib/testrand.c

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/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <stdlib.h>
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#include <stdio.h>
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int
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main (void)
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{
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  int i1, i2;
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  int j1, j2;
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  /* The C standard says that "If rand is called before any calls to
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     srand have been made, the same sequence shall be generated as
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     when srand is first called with a seed value of 1." */
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  i1 = rand();
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  i2 = rand();
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  srand (1);
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  j1 = rand();
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  j2 = rand();
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  if (i1 < 0 || i2 < 0 || j1 < 0 || j2 < 0) {
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      puts ("Test FAILED!");
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  }
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  if (j1 == i1 && j2 == i2)
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    {
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      puts ("Test succeeded.");
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      return 0;
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    }
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  else
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    {
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      if (j1 != i1)
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	printf ("%d != %d\n", j1, i1);
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      if (j2 != i2)
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	printf ("%d != %d\n", j2, i2);
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      puts ("Test FAILED!");
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      return 1;
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    }
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}