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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Formal systems that cannot possibly be incomplete except for
 unknowns and unknowable
Date: Thu, 8 May 2025 00:22:08 -0500
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On 5/7/2025 11:09 PM, Richard Heathfield wrote:
> On 08/05/2025 02:20, olcott wrote:
> 
> <snip>
> 
>> Does there exist an HHH such that DDD emulated by
>> HHH according to the rules of the C programming language
> 
> Let's take a look.
> 
> The file is 1373 lines long, but don't worry, because I plan to stop at 
> HHH's first departure from the rules of the C programming language (or 
> at least the first departure I spot).
> 
> Turn in your songbook if you will to:
> 
> void CopyMachineCode(u8* source, u8** destination)
> {
>    u32 size;
>    for (size = 0; source[size] != 0xcc; size++)
>      ;
>    *destination = (u8*) Allocate(size);
>    for (u32 N = 0; N < size; N++)
>    {
>      Output("source[N]: ", source[N]);
>      *destination[N] = source[N];
>    }
>    ((u32*)*destination)[-1] = size;
>    Output("CopyMachineCode destination[-1]: ", ((u32*)*destination)[-1]);
>    Output("CopyMachineCode destination[-2]: ", ((u32*)*destination)[-2]);
> };
> 

deprecated.

> I'll ignore the syntax error (a null statement at file scope is a rookie 
> error).
> 
> Instead, let's jump straight to this line:
> 
>    *destination = (u8*) Allocate(size);
> 
> On line 79 of my copy of the code, we find:
> 
> u32* Allocate(u32 size) { return 0; }
> 
> In C, 0 is a null pointer constant, so Allocate returns a null pointer 
> constant... which is fine as long as you don't try to deref it. So now 
> *destination is NULL.
> 
> We go on:
> 
>    for (u32 N = 0; N < size; N++)
>    {
>      Output("source[N]: ", source[N]);
>      *destination[N] = source[N];
>    }
> 
> *destination[N] is our first big problem (we're ignoring syntax errors, 
> remember). destination is a null pointer, so destination[N] derefs a 
> null pointer.
> 
> That's a fail. 0/10, D-, go away and write it again. And you /dare/ to 
> impugn other people's C knowledge! Crack a book, for pity's sake.
> 

If you can't even understand what is essentially
an infinite recursive relationship between two functions
except that one function can terminate the other then
you don't have a clue about the essence of my system.

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