Do Loop

[Craig Lindley]

What should be the behavior of this loop?

: test 1 1 do i . loop ;

I was under the impression that the loop should not execute but it runs to infinity

[Phil Burk]

In some older Forths, "1 1 DO" would skip the loop. But in the newer ANSI Forths, it is expected to loop forever.

I think that is odd, but there is probably a good reason.

You may want to use ?DO because it will check for equal indices and skip the loop when you expect.

Phil Burk

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[Helmut Eller]

In addition to what Phil said, I would add "always use ?DO instead of
DO" and "never use N +LOOP with negative N".

Helmut