Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!ucsd!ucbvax!IFI.UIO.NO!oluf
From: oluf@IFI.UIO.NO (Asle Olufsen)
Newsgroups: comp.sys.handhelds
Subject: Poor documentation ?
Message-ID: <CMM.0.88.654449256.oluf@skaget.ifi.uio.no>
Date: 27 Sep 90 18:21:40 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: inet
Organization: University of Oslo, Norway.
Lines: 34
X-Unparsable-Date: Thu, 27 Sep 90 17:27:36 MET DST

HP48SX is great, but the manuals are a little thin. There is 3 (as I
remember) function that is almost undocumentet. That is NEWOB, APPLY
and QUOTE. Is there someone who may explain these functions or give
examples of use ?

As a test I created the following program:

\<< \-> X 
    \<< HALT 
    \>>
\>>

or  << -> X << HALT >> >> 

I put 1 on the stack and starts the program. The info-area says HALT
and X ENTER gives 1 and 'X' EVAL does the same. When I do CONT this
effect dissapears. So far so god.

Then I put 'X' and 2 on the stack and starts the program. HALT comes
up and 'X' is on the stack. I do EVAL and get 'X'. Nothing happens.  I
may put 'X' on the stack now and do EVAL and gets 2, but a 'X' that is
on the stack before I starts the program does not get evaluated.  OK,
so HP uses statical variabel bindings not dynamic. This could be
useful.

Then I do CONT and clears the stack. And I put 3 on the stack and starts
the program. HALT comes up and I put 'X' on the stack. Then I do CONT
which removes the HALT but leaves the 'X' on the stack. Then I do EVAL
end gets Eval error: Undefined Local Name. Rats. HP does not use
stacical variable binding either. Or do they ? It is perhaps better
to say that they use a kind of stacical variable binding which can't
be used for something useful. Annoying.

Oluf                             Email: oluf@ifi.uio.no