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glibc  2.9
testrand.c
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00001 /* Copyright (C) 1992, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdlib.h>
00020 #include <stdio.h>
00021 
00022 int
00023 main (void)
00024 {
00025   int i1, i2;
00026   int j1, j2;
00027 
00028   /* The C standard says that "If rand is called before any calls to
00029      srand have been made, the same sequence shall be generated as
00030      when srand is first called with a seed value of 1." */
00031   i1 = rand();
00032   i2 = rand();
00033   srand (1);
00034   j1 = rand();
00035   j2 = rand();
00036   if (i1 < 0 || i2 < 0 || j1 < 0 || j2 < 0) {
00037       puts ("Test FAILED!");
00038   }
00039   if (j1 == i1 && j2 == i2)
00040     {
00041       puts ("Test succeeded.");
00042       return 0;
00043     }
00044   else
00045     {
00046       if (j1 != i1)
00047        printf ("%d != %d\n", j1, i1);
00048       if (j2 != i2)
00049        printf ("%d != %d\n", j2, i2);
00050       puts ("Test FAILED!");
00051       return 1;
00052     }
00053 }