Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Mikko Newsgroups: comp.theory Subject: Re: DDD simulated by HHH cannot possibly halt (Halting Problem) Date: Fri, 4 Apr 2025 11:22:40 +0300 Organization: - Lines: 26 Message-ID: References: <1645f6b2cfe0442e89650571ed26dd65d8253691@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 04 Apr 2025 10:22:40 +0200 (CEST) Injection-Info: dont-email.me; posting-host="670086d25131323072cd2a1bcb3678f0"; logging-data="3169423"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+bC1MkKEIsSerxNiJeNHak" User-Agent: Unison/2.2 Cancel-Lock: sha1:Ak+wbEV2oMYVzsfBrsAvMHTt4bI= On 2025-04-04 02:06:52 +0000, olcott said: > On 4/3/2025 8:59 PM, Richard Damon wrote: >> On 4/3/25 9:27 PM, olcott wrote: >>> void DDD() >>> { >>>     HHH(DDD); >>>     return; >>> } >>> >>> Do you really think that anyone knowing the C >>> programming language is too stupid to see that >>> DDD simulated by HHH cannot possibly return? >> >> But if HHH doesn't do a complete emulation, it doesn't show that its >> input is non-halting, > > In other words you're convinced that a C > program cannot see what every C programmer sees? That indeed is how it usually is. A C program can only see what it is programmed to see. Most programmers can see more. -- Mikko