[Gambas-user] Doesn't IF NOT exist? Bug or feature? Or my bad logic?

[Benoît Minisini]

> Rolf-Werner Eilert wrote:
> > Just stumbled over this when trying to implement a small copying
> > function:
> >
> >    FOR EACH datei IN Dir(opfad, odatei & ".*")
> >      IF NOT file.Ext(opfad &/ datei) = "lock" THEN
> >        COPY opfad &/ datei TO ziel &/ datei
> >        SELECT CASE file.Ext(ziel &/ datei)
> >        CASE "fehl", "feldbak", "felder", "notizen"
> >          SHELL "chgrp kartei " & ziel &/ datei WAIT
> >          SHELL "chmod 660 " & ziel &/ datei WAIT
> >        CASE "konto", "kontobak", "ktx", "ktxbak"
> >          SHELL "chgrp konto " & ziel &/ datei WAIT
> >          SHELL "chmod 660 " & ziel &/ datei WAIT
> >        END SELECT
> >      END IF
> >    NEXT
> >
> > IF NOT ... = ... THEN
> >
> > wouldn't copy anything, although only one file has the given extension.
> > When I change this line into
> >
> > IF file.Ext(opfad &/ datei) <> "lock" THEN
> >
> > everything runs as expected. Doesn't make sense to me as both ways
> > should mean the same in my understanding of logical NOT (which doesn't
> > mean too much... :-) )
> >
> > Regards
> >
> > Rolf
> 
>  From the docs, NOT is an operator that makes a boolean it's opposite
> (TRUE turns to FALSE and vice versa) and will also invert each bit in an
> integer.  NOT(11) = -12 because that's what you get when you change
> every bit from on to off and vice versa.
> 
>  From other examples in the docs, if you NOT a string with something in
> it, you will get FALSE.  However, if you NOT an empty string, you will
> get TRUE.
> 

In other words, try to use brackets: IF NOT (...) = ... THEN


-- 
Benoît Minisini