Re: Halting Problem proofs appear to be bogus!

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.theory
Subject	Re: Halting Problem proofs appear to be bogus!
Date	2021-07-16 19:50 +0100
Organization	A noiseless patient Spider
Message-ID	<875yxaqejg.fsf@bsb.me.uk> (permalink)
References	(4 earlier) <20210716153956.0000250e@reddwarf.jmc> <616f5c77-200c-49e9-9e1e-62a3689f515cn@googlegroups.com> <sJudneEu_IO9M2z9nZ2dnUU7-KXNnZ2d@giganews.com> <3a5c97d3-f389-4df4-8e72-d88fd60168a0n@googlegroups.com> <ZsudnX3FnYt1Jmz9nZ2dnUU7-eWdnZ2d@giganews.com>

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olcott <NoOne@NoWhere.com> writes:

>> I can not follow your sentence well. In this case, Func is a
>> function pointer: typedef void (*Func)();
>
> A function pointer is also the machine address of the function.

Not necessarily.  I worked on a C implementation for an architecture in
which functions where just numbered.  It was very handy when debugging.
You got to know, after a while, that a call to function number 13 was
printf (or whatever).

Of course the CPU had a way to get from the number to the code, but
there was no "machine address" for that code.

I suppose you could call the number the "machine address of the
function", but it was not a address in any useful sense of the word.

-- 
Ben.

Thread

Halting Problem proofs appear to be bogus! Mr Flibble <flibble@reddwarf.jmc> - 2021-07-16 14:24 +0100
  Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-16 14:34 +0100
    Re: Halting Problem proofs appear to be bogus! Mr Flibble <flibble@reddwarf.jmc> - 2021-07-16 14:39 +0100
      Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 09:36 -0500
        Re: Halting Problem proofs appear to be bogus! Mr Flibble <flibble@reddwarf.jmc> - 2021-07-16 15:39 +0100
          Re: Halting Problem proofs appear to be bogus! wij <wyniijj@gmail.com> - 2021-07-16 08:38 -0700
            Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 11:04 -0500
              Re: Halting Problem proofs appear to be bogus! wij <wyniijj@gmail.com> - 2021-07-16 09:25 -0700
                Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 12:03 -0500
                Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-16 19:50 +0100
        Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-16 15:46 +0100
      Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-16 15:40 +0100
        Re: Halting Problem proofs appear to be bogus! Mr Flibble <flibble@reddwarf.jmc> - 2021-07-16 15:42 +0100
          Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-17 01:06 +0100
            Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-17 10:52 -0500
      Re: Halting Problem proofs appear to be bogus! Andy Walker <anw@cuboid.co.uk> - 2021-07-16 16:12 +0100
        Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 10:52 -0500
          Re: Halting Problem proofs appear to be bogus! wij <wyniijj@gmail.com> - 2021-07-16 09:11 -0700
            Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 11:15 -0500
    Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 09:13 -0500
      Re: Halting Problem proofs appear to be bogus! wij <wyniijj@gmail.com> - 2021-07-16 08:32 -0700
      Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-17 01:03 +0100
        Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-17 10:46 -0500
          Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-18 02:32 +0100
            Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-19 10:10 -0500
              Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-20 01:35 +0100
                Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-20 09:24 -0500
                Re: Halting Problem proofs appear to be bogus! Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-07-21 01:28 +0100
              Re: Halting Problem proofs appear to be bogus! Richard Damon <Richard@Damon-Family.org> - 2021-07-19 20:48 -0700
  Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-16 15:27 +0100
    Re: Halting Problem proofs appear to be bogus! Mr Flibble <flibble@reddwarf.jmc> - 2021-07-16 15:36 +0100
      Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 10:02 -0500
        Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-16 22:09 +0100
      Re: Halting Problem proofs appear to be bogus! wij <wyniijj@gmail.com> - 2021-07-16 08:46 -0700
      Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-16 22:07 +0100
        Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 16:20 -0500
          Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-16 22:25 +0100
            Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 16:32 -0500
              Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-17 11:48 +0100
    Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 09:44 -0500
      Re: Halting Problem proofs appear to be bogus! Peter <peterxpercival@hotmail.com> - 2021-07-16 22:10 +0100
  Re: Halting Problem proofs appear to be bogus! olcott <NoOne@NoWhere.com> - 2021-07-16 09:32 -0500

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