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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: Fri, 17 May 2024 18:45:31 -0500
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On 5/17/2024 3:02 PM, Alan Mackenzie wrote:
> olcott <polcott333@gmail.com> wrote:
>> On 5/16/2024 11:15 AM, Alan Mackenzie wrote:
>>> olcott <polcott333@gmail.com> wrote:
>>>> On 5/16/2024 5:48 AM, Mikko wrote:
>>>>> On 2024-05-15 15:24:57 +0000, olcott said:
> 
>>> [ .... ]
> 
>>>>> Normal semantics is that the program is not executed.
> 
>>> Indeed.
> 
>>>>>> typedef int (*ptr)();  // ptr is pointer to int function
>>>>>> 00 int H(ptr x, ptr x);
>>>>>> 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   return 0;
>>>>>> 13 }
> 
>>>>> Can you find any compiler that is liberal enough to accept that?
> 
>>>> It has been fully operational code under Windows and
>>>> Linux for two years.
> 
>>> That is another of your lies.  It's largely why I despise you so much.
> 
>>> Although you've fixed the missing semicolon on line 0 (at last), it still
>>> fails to compile under any C compiler worthy of the name.  With all the
>>> errors in it it still would have failed to compile under Linux or Windows
>>> ever since it was written.
> 
>>> Quit lying.  And fix that program fragment, assuming your C skills are up
>>> to it.
> 
>> There are many postings in this group providing the
>> actual execution trace output of that program.
> 
> That "program" doesn't compile.  It's ill-formed. 
*This <is> the code that you said would not compile*
*This <is> the code that you said would not compile*
*This <is> the code that you said would not compile*

typedef int (*ptr)();
int H(ptr P, ptr I);

int D(ptr x)
{
   int Halt_Status = H(x, x);
   if (Halt_Status)
     HERE: goto HERE;
   return Halt_Status;
}

int main()
{
   H(D,D);
   return 0;
}

*Not only does this code compile, it also meets C11 and C17 standards*
*Not only does this code compile, it also meets C11 and C17 standards*
*Not only does this code compile, it also meets C11 and C17 standards*


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