OpenEuphoria

Re: Coming From QBasic

• Posted by "Lynn Kilroy" <leks_transportation at hotmail.com> Jan 17, 2006
• 538 views

It's case sensative? {Looks throught the docs} I don't think I saw that
mentioned anywhere.


>From: Jason Gade <guest at RapidEuphoria.com>
>Reply-To: EUforum at topica.com
>To: EUforum at topica.com
>Subject: Re: Coming From QBasic
>Date: Tue, 17 Jan 2006 09:23:10 -0800
>
>
>posted by: Jason Gade <jaygade at yahoo.com>
>
>Lynn Kilroy wrote:
> >
> > I see nothing wrong with passing an argument to a subroutine/procedure=

>{to
> > me, these are really the same thing}, and allowing that subroutine to=

>alter
> >
> > it.  In QBasic, if I said:
> >
> > >DECLARE SUB Inke (a AS STRING)
> > >
> > >SUB Inkey (a AS STRING)
> > >a = INKEY$
> > >END SUB
> >
> > what I'm saying is Inkey requires the argument 'a,' which passes data t=
o
>and
> >
> > can also extract data from the subroutine.   If I included a local
>variable
> >
> > in that subroutine:
> >
> > >DECLARE SUB Inke (a AS STRING)
> > >
> > >SUB Inkey (a AS STRING)
> > >
> > >DIM Variable AS DOUBLE
> > >
> > >Variable = RND
> > >
> > >a = INKEY$
> > >
> > >END SUB
> >
> > then Variable is only remembered by Inkey. but is never seen by the res=
t
>of
> >
> > the program.  In this case, it is a useless excercise becuase nothing i=
s
> > done with it.  As you say, local versus global.
> >
> > Also, in both cases above, the line
> >
> > >SUB Inkey (a AS STRING)
> >
> > means you *MUST* pass it an argument.  That argument can be either a
> > variable pointer or a constant hard coded as an argument.  In the case=

>of
> > Inkey, you could pass it arguments the following way, and they would al=
l
> > work.
> >
> > >DIM KeyPress AS STRING
> > >
> > >Inkey KeyPress
> >
> > -Or-
> >
> > >Inkey X$
> >
> > -Or-
> >
> > >Inkey " "
> >
> > The first two are variables.  I never use the signed variables.  Poor=

>form,
> >
> > and rather tasteless to me, anymore, so the middle one is out.  But I=

>use
> > variations of the top and bottom lines quite frequently, although in th=
e
> > case of Inkey, calling Inkey with " " as the argument {a hard coded
> > constant} rather defeats the purpose.
> >
> > In Euphoria, the sub would look different.  I'm going to use your code=

>and
> > take a whack at it.
> >
> > >Procedure Inkey(Integer Key)
> > >     Key = get_key()
> > >End Procedure
> > >
> > >Integer Key
> > >
> > >Inkey(Key)
> >
> > Would this work?  If not this precisely, then how would it be coded,
> > precisely?  The difference isn't so much that I use a global variable=

>for it
> >
> > {Blech!} but that I pass a variable to it, and the variable is altered=

>by
> > the Subroutine/Procedure and then passed back to the main program {if=

>the
> > main program had a variable pointer in the first place}.
> >
> > Love & Friendship & Blessed Be!
> > Lynn Erika Kilroy
>
>No, this wouldn't work because Euphoria doesn't use pointers and doesn't=

>allow you to modify a variable passed in as an argument.
>
>Euphoria is case-sensitive, too, so "Integer" would not work in place of=

>"integer". Unless you defined "Integer" seperately.
>
>--
>"Actually, I'm sitting on my butt staring at a computer screen."
>                                                   - Tom Tomorrow
>
>j.
>
>
>
>