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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
Date: Wed, 9 Feb 2011 10:23:23 -0800 (PST)
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Date: 2011-02-09T10:23:23-08:00
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On Feb 9, 9:48=A0am, Hyman Rosen <hyro...@mail.com> wrote:

> > It is theoretically possible to say if a program is correct
>
> No it's not, because the statement of correctness is equivalent to
> the program itself; you simply push the potential error out one level.

Of course it is!
Just as we can prove whether some procedure is correct or not.

Function Fib( N : Positive ) Return Positive is
begin
   Case N is
     When 1 =3D> Return 1;
     When 2 =3D> Return 1;
     When Others =3D> Return Fib(N-1) + Fib(N-2);
   end case;
end Fib;

is provable for correctness; so long the resultant summation
stays in the realm of the computer's [finite] number-system;
when it attempts to exceed those limits an exception is raised
as both expected and required.