Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!portal!cup.portal.com!jfh
From: jfh@cup.portal.com (Jack F Hamilton)
Newsgroups: comp.lang.rexx
Subject: Getting out of a do-until
Message-ID: <20036@cup.portal.com>
Date: 30 Jun 89 19:49:27 GMT
References: <7074@bunny.GTE.COM>
Organization: The Portal System (TM)
Lines: 25

I tried to post this before but I don't think I succeeded.  If you get it 
twice, please ignore one... 
-
I am working on a program with 2 nested DO loops:

   outerloop: do until (a=1)
                 /* stuff */
   innerloop:    do until (b=2)
                 /* more stuff */
                    end /* of innerloop */
                 end /* of outerloop */

Inside the inner loop, at "more stuff", I will sometimes want to drop out
of the inner loop and go back to the outer loop.  An "iterate outerloop"
instruction would do exactly what I want.

Unfortunately, the iterate instruction works only if the do-loop has a
control variable, which a do-until does not.

Is there a way to do what I want?  Is there a better way of thinking about
the problem that doesn't require an iterate at all?  I don't think it
would be a good idea to use SIGNAL.

                         Jack Hamilton
                         jfh@cup.portal.com