Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: Tim Rentsch Newsgroups: comp.lang.c Subject: Re: srand(0) Date: Wed, 07 Jan 2026 07:46:40 -0800 Organization: A noiseless patient Spider Lines: 17 Message-ID: <86344hpgrj.fsf@linuxsc.com> References: <10ib0ka$3cgil$1@dont-email.me> <10ibava$2sora$1@dont-email.me> <10ibcub$25ihi$2@dont-email.me> <10ibu81$2sora$2@dont-email.me> <10ibvrm$25ihh$2@dont-email.me> <20251222204538.00003fc2@yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Date: Wed, 07 Jan 2026 15:46:44 +0000 (UTC) Injection-Info: dont-email.me; posting-host="96c89593a79aadfcc4daf354c711affa"; logging-data="798811"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19J5B/na9XzC1tL57APDyO8V7/+ZEN27A4=" User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.4 (gnu/linux) Cancel-Lock: sha1:U32V9ubxgZS9SuxiPX+0wgT2Bmc= sha1:+qDWeITkqzSWMdfcxzilJiffWJI= Xref: csiph.com comp.lang.c:396268 Michael S writes: [regarding rand() and srand()] > Pay attention that C Standard only requires for the same seed to always > produces the same sequence. There is no requirement that different > seeds have to produce different sequences. > So, for generator in your example, implementation like below would be > fully legal. Personally, I wouldn't even consider it as particularly > poor quality: > > void srand(unsigned seed ) { init = seed | 1;} It seems better to do, for example, void srand(unsigned seed ) { init = seed - !seed;}