In a programming language with no GOTOs (although they can be simulated), if a FOR loop, upon completing its iterations, then transfers to an earlier FOR loop in the same program, does it always transfer to the INCREMENT (not the first iteration) of that earlier FOR, or could it transfer to the INITIALIZE (the first iteration) of that earlier FOR?

I am writing a PHP interpreter in PHP and thought the answer is yes, but am not so sure now.

C-B

On 8/12/23 11:55 AM, Charlie-Boo wrote:
> In a programming language with no GOTOs (although they can be simulated), if a FOR loop, upon completing its iterations, then transfers to an earlier FOR loop in the same program, does it always transfer to the INCREMENT (not the first iteration) of that earlier FOR, or could it transfer to the INITIALIZE (the first iteration) of that earlier FOR?
>
> I am writing a PHP interpreter in PHP and thought the answer is yes, but am not so sure now.
>
> C-B

The inner "for" loop, when it completes, will fall-through to the its
end, which will eventually (or maybe immediately) reach the end of the
body of the outer "for" loop, which will cause its iteration (increment)
clause to execute.

The "initialization" clause is only run on entering the for loop from
outside of it, never as a result of the loop running.

Note, the INNER "for" loop will perform its initialization clause every
time it is entered from the running of the outer "for" loop.