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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Every D(D) simulated by H presents non-halting behavior to H ###
Date: Tue, 14 May 2024 09:35:42 -0500
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On 5/14/2024 4:52 AM, Mikko wrote:
> On 2024-05-13 14:43:09 +0000, olcott said:
> 
>> On 5/13/2024 4:14 AM, Mikko wrote:
>>> On 2024-05-13 04:54:30 +0000, immibis said:
>>>
>>>> On 10/05/24 19:55, Alan Mackenzie wrote:
>>>>> [ Followup-To: set ]
>>>>>
>>>>> In comp.theory olcott <polcott333@gmail.com> wrote:
>>>>>
>>>>> [ .... ]
>>>>>
>>>>> I've tried out your much spammed code on GCC (see below).  It is clear
>>>>> you have never built or run this code, which ironically can't reach 
>>>>> Line
>>>>> 06.  It can't even reach line 00.
>>>>>
>>>>>> Richard tried to get away with D never simulated by H as an example
>>>>>> of D simulated by H:
>>>>>
>>>>>> Message-ID: <v0ummt$2qov3$2@i2pn2.org>
>>>>>> On 5/1/2024 7:28 PM, Richard Damon wrote:
>>>>>
>>>>>> *That people say they know I am wrong yet will not show the detailed*
>>>>>> *steps of how I am wrong indicates that they are probably liars*
>>>>>
>>>>> You have said, or at least implied that your code fragment is 
>>>>> runnable.
>>>>> I think you are the liar, here.
>>>>>
>>>>>> 00 int H(ptr x, ptr x)  // ptr is pointer to int function
>>>>>> 01 int D(ptr x)
>>>>>> 02 {
>>>>>> 03   int Halt_Status = H(x, x);
>>>>>> 04   if (Halt_Status)
>>>>>> 05     HERE: goto HERE;
>>>>>> 06   return Halt_Status;
>>>>>> 07 }
>>>>>> 08
>>>>>> 09 int main()
>>>>>> 10 {
>>>>>> 11   H(D,D);
>>>>>> 12 }
>>>>>
>>>>>
>>>>> .  These are the diagnostics generated by GCC:
>>>>>
>>>> And the halting problem is about Turing machines, anyway.
>>>
>>> Not necessarily. The same question can be asked about different 
>>> machines.
>>> The restriction to Turing machines is just one way to ensure that the
>>> problem is well defined.
>>>
>>
>> Well put. All computable functions even if written in C.
> 
> You still must ensure that the problem is well defined. With C there is
> the problem that conforming C programs often fail to be strictly 
> conforming.
> If a program is not strictly conforming it may be interpreted as halting
> by some implementation and non-halting or incorrect by another.
> 

00 int H(ptr x, ptr x)  // ptr is pointer to int function
01 int D(ptr x)
02 {
03   int Halt_Status = H(x, x);
04   if (Halt_Status)
05     HERE: goto HERE;
06   return Halt_Status;
07 }
08
09 int main()
10 {
11   H(D,D);
12 }

One can correctly determine that every D simulated by H
never reaches past its own line 03.

-- 
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer