Date: Tue, 04 Feb 2003 15:23:28 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: David Schultz <dschultz@uclink.Berkeley.EDU>, Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.ORG Subject: Re: rand() is broken Message-ID: <xzpfzr4untr.fsf@flood.ping.uio.no> In-Reply-To: <20030204140052.GA93115@nagual.pp.ru> ("Andrey A. Chernov"'s message of "Tue, 4 Feb 2003 17:00:52 %2B0300") References: <20030202090422.GA59750@nagual.pp.ru> <20030203002639.GB44914@HAL9000.homeunix.com> <20030203100002.GA73386@nagual.pp.ru> <20030204054020.GA2447@HAL9000.homeunix.com> <20030204094659.GA87303@nagual.pp.ru> <20030204115237.GA6483@HAL9000.homeunix.com> <xzpfzr4b3pw.fsf@flood.ping.uio.no> <20030204131006.GB92301@nagual.pp.ru> <20030204131748.GA92510@nagual.pp.ru> <xzpwukgupnm.fsf@flood.ping.uio.no> <20030204140052.GA93115@nagual.pp.ru>
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"Andrey A. Chernov" <ache@nagual.pp.ru> writes: > On Tue, Feb 04, 2003 at 14:43:57 +0100, Dag-Erling Smorgrav wrote: > > All that being said, adding 1 to *ctx before returning it (see patch) > > adresses both of your objections: a seed of 0 will not cause the LCG > > to get stuck, and the result of rand() will range between 0 and > > RAND_MAX inclusive. > Adding +1 you break algorithm formulae badly from math point of view, > something else then given formulae not allowed here. You can change 'a' > parameter to anything you want, but not add something at the end. Do the math - adding 1 after the modulo operation is equivalent to setting a == k. DES -- Dag-Erling Smorgrav - des@ofug.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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