Re: Every sufficiently competent C programmer knows

On 3/11/2025 5:01 AM, Richard Heathfield wrote:

On 11/03/2025 08:55, Fred. Zwarts wrote:

Op 11.mrt.2025 om 00:41 schreef olcott:

typedef void (*ptr)();
int HHH(ptr P);
>
void Infinite_Loop()
{
   HERE: goto HERE;
   return;
}
>
void Infinite_Recursion()
{
   Infinite_Recursion();
   return;
}
>
void DDD()
{
   HHH(DDD);
   return;
}
>
int DD()
{
   int Halt_Status = HHH(DD);
   if (Halt_Status)
     HERE: goto HERE;
   return Halt_Status;
}
>
That when HHH correctly emulates N steps of the
above functions that none of these functions can
possibly reach their own "return" instruction
and terminate normally.

>

>
Since HHH does see that same pattern that competent
C programmers see it correctly aborts its emulation
and rejects these inputs as non terminating.

>
All competent C programmers see that HHH correctly reports that it cannot possibly reach the 'return' instruction.

 First, my credentials. I've been programming in C for over 35 years; I'm told that my book on C has been used on two undergraduate Comp Sci courses (one in the States and one in the UK); and I have my Knuth cheque. I don't claim to be any kind of programming guru, but I hope I do not overstate the case when I suggest that I can be regarded as competent not just as a programmer but specifically in the C language.
 And yet I can't even /see/ HHH, let alone judge what it does or does not do correctly. All I see is a call to it.
 

It is stipulated that HHH correctly emulates N
steps of the x86 machine code of its input functions.
This may or may not include HHH emulating itself
emulating an input.

And ld concurs. It can't see HHH either.
 I suggest that Mr Olcott should supply the missing source code if he wishes to be taken seriously.
 

Not required for the above thought experience where
every relevant behavior has been fully specified. This
is merely another lame attempt on your part to perpetually
dodge the point.
--
Copyright 2025 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer