Re: ti89: questions

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: ti89: questions
From: Laurent Deniau <Laurent.Deniau@CERN.CH>
Date: Mon, 29 Mar 1999 16:04:00 +0200
Organization: CERN. European Lab. for Particle Physics
References: <36FF4BEC.9B8BA71F@cern.ch> <3XKL2.10289$jD1.61494@newsfeed.slurp.net>
Reply-To: Laurent Deniau <Laurent.Deniau@CERN.CH>
Xref: paladin.american.edu bit.listserv.calc-ti:28578

Tom Lake wrote:
>
> Laurent Deniau <Laurent.Deniau@cern.ch> wrote in message
> 36FF4BEC.9B8BA71F@cern.ch">news:36FF4BEC.9B8BA71F@cern.ch...
> > Sorry, but I can't find out the answers to these questions in the
> manual...
> >
> > 1) How do you modify and/or return a local variable or parameter of a
> > sub-program (I don't want to use a global variable) ?
> >
> > printstr()
> > Prgm
> > Local getname, name
> > Define getname(name)=Prgm
> >  Request "file name",name
> >  Return name     (Meaningless for program)
> >  EndPrgm
> > getname()->name  (Forbidden for programs)
> > EndPrgm
>
> You can't use name as both a parameter and a local variable.  If you want to
> pass name to the sub, use it in the parentheses as above.  Local variables
> can't be modified permanently.  They cease to exist after the program ends.
>
> Tom Lake
> ICQ #25589135

I know what is a local variable... My question is:

How do I return a value from a program ? I can't use a function since I
need to get the value from the user (needs I/O) and the TI basic doesn't
authorise to do I/O inside functions (strange limitation). I can't use
program since I need to return a value. For common language, you can either
modify a parameter or return a value (Basic) or both (Pascal, C). This is
essential for the completeness of the language !

The limitation of I/O inside functions forbids the second case. Then I need
a way to solve the first case. Then again:

How do you modify a parameter of a program ?

Thanks,

        Laurent.

--
[ Deniau Laurent -- Numerical Analysis and Signal Processing ]
[    CERN -- The European Laboratory for Particle Physics    ]
[   Laurent.Deniau@cern.ch -- http://home.cern.ch/~ldeniau   ]
[      -- One becomes old when dreams become regrets --      ]

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References:

ti89: questions

From: Laurent Deniau <Laurent.Deniau@CERN.CH>

Re: ti89: questions

From: Tom Lake <tomlake@SLIC.COM>