[OT] dodgy physics [Was: beginner with programming, how to learn to debug and few C general questions]

On 25 June, 19:23, Keith Thompson <ks...@xxxxxxx> wrote:
Tim Rentsch <t...@xxxxxxxxxxxxxxxxxxx> writes:
Flash Gordon <s...@xxxxxxxxxxxxxxxxx> writes:
Tim Rentsch wrote:
Flash Gordon <s...@xxxxxxxxxxxxxxxxx> writes:
Tim Rentsch wrote:

Also, the observable behaviour of the physical machine
has to be the same as the required observable behviour of the abstract
machine.

That's nonsense, of course it doesn't.  The Standard might
/specify/ that the behaviors must match, but that isn't
the same as saying they /do/ match when a program is
actually run.  Statements in the Standard can't change
the laws of physics.

None of the standard requirements, as far as I'm aware, ever require
violating the laws of physics.

Providing an absolute guarantee that an actual program execution be
consistent with the semantic description of ISO C cannot be done under
the laws of physics (at least not at we currently understand them).
If you agree that the Standard does not expect any such absolute
guarantee, then we are in agreement;  if not, I'd be curious to hear
which passages in the Standard you think imply such an expectation.

I'd be curious to hear which laws of physics must necessarily be
violated by a conforming C program.

[I've *gotta* give this a shot]

Isn't the very concept of a deterministic computation fly in the face
of modern quantum mechanics?

<snip>
.

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