rand() uses (IIRC) the built-in rand() function on your platform. This is a
pseudo-random number generator, not true random numbers. Perhaps the rand() function
is not up to snuff on your OS.
BTW, random doesn't neccessarily mean no duplicates. The sequence 5 5 5 5 5 is
just as likely as the sequence 3 2 4 1 5 or 1 2 3 4 5. It just doesn't look random
to us humans, who are wired for pattern recognition.
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