A more concise expression of the problem: t0=.3 :0 0 if. 0 if. 0 do. 1 end. do. 1 end. ) t0 '' 1
Certainly seems like a bug to me. Marshall -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of bill lam Sent: Wednesday, November 03, 2010 9:50 PM To: [email protected] Subject: Re: [Jprogramming] Is this a control-structure bug? I guess the sentence if. 0 do. 1 end. actually evaluated to i.0 0 which becomes the last value for the entire T block. Срд, 03 Ноя 2010, Henry Rich писал(а): > I don't think there is any such thing as an 'empty sentence'. T > blocks containing no sentences are true, but a blank line (which would > surely be an empty sentence, no?) does not become true: > > t =: 3 : 0 > if. > 0 > > do. 1 else. 2 end. > > ) > t '' > 2 > > > What I am trying to do is something akin to C's left-to-right && . > > if. > if. (thing exists) do. > test that thing has desired property > end. > do. > NB. code here executed if thing exists & has the desired property > end. > > I can work around it. > > Henry Rich > > > On 11/3/2010 8:45 PM, Raul Miller wrote: > > On Wed, Nov 3, 2010 at 6:16 PM, Henry Rich<[email protected]> wrote: > >> tvb =: 3 : 0 > >> if. 0 do. > >> 0 > >> elseif. 0 if. 0 do. 1 end. do. > >> 1 > >> elseif. do. > >> 2 > >> end. > >> ) > >> tvb '' > >> 1 > >> > >> I was expecting 2. > > > > This looks odd, but I am not sure it is a bug: > > > > You have an empty sentence after the nested if sentence, and I think > > empty sentences are treated as true. > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
