Re: Best way to get a non-repeating random number?
Re: Best way to get a non-repeating random number?
- Subject: Re: Best way to get a non-repeating random number?
- From: "Luca C." <email@hidden>
- Date: Tue, 14 Apr 2009 12:26:16 +0200
2009/4/14 Uli Kusterer <email@hidden>
> On 14.04.2009, at 01:44, Luca C. wrote:
>
>> You can put every (unsigned) value you want in there, though in
>> general it's used passing (unsigned)time(NULL) as parameter. This way
>> you'll always get a different int.
>>
>
>
> No you won't. It's a *random* number generator. The seed simply means you
> get a different sequence of random numbers. However, random really means
> RANDOM. I.e. it's perfectly possible to get the same number three times in a
> row during a sequence. That would still be random.
Hmm...
Given a seed, rand() will create always the same sequences for that seed.
But if the seeds changes all the time, you'll always get different
sequences, as it's obvious. You'll get the same sequences only if you pass
the same seed again, otherwise you'll get some other sequences.
In practical use of rand() I have never seen what you're saying, though
it's possible. But that doesn't imply that you'll get every time the same
number consequentally in a sequence, that's very rare case if you use
different seeds, very rare.
Am i wrong?
--Luca C.
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