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From: rxb@rayssdb.RAY.COM (Richard A. Brooks)
Newsgroups: comp.lang.pascal
Subject: Re: TP problem
Message-ID: <1808@rayssdb.RAY.COM>
Date: Fri, 13-Nov-87 12:11:07 EST
Article-I.D.: rayssdb.1808
Posted: Fri Nov 13 12:11:07 1987
Date-Received: Sun, 15-Nov-87 09:59:00 EST
References: <16249@topaz.rutgers.edu> <936@sask.UUCP>
Sender: rxb@rayssdb.RAY.COM (Richard A. Brooks @ Raytheon Company, Portsmouth RI)
Organization: Raytheon Company, Portsmouth RI
Lines: 45
Keywords: ennumerated type error
Summary: writeln(v) gives same error!!!

In article <936@sask.UUCP>, lowey@sask.UUCP (Kevin Lowey) writes:
> In article <16249@topaz.rutgers.edu>, jjoshua@topaz.rutgers.edu (Jonathan Joshua) writes:
> > 
> > v is a variable with an ennumerated type, right?
> 
>      right
> 
> > readln(v) ;
> > gives an I/O not allowed error. I am using turbo pascal.
> > Am I doing something wrong or do I need a REAL compiler?
> 
>   As far as I know, PASCAL only accepts input from the console into 
> STRING (array of char), integer, or real types.  All other types (arrays, 
> records, enumerated types, and any other type you define) can only be written
> to and read from files.

But a writeln(v) will give you the same error!!!!

 Try this:
program TEST;

type
  ON_OFF    = (ON,OFF);

var
  v 	    = ON_OFF;

begin
	readln(v);
	writeln('Switch is now ',v);
end.

	Upon compiling the above, you will recieve an I/O not 
	allowed error at the "readln(v)" and the "writeln(v)",
	if the readln is removed.

	TP does NOT allow you to read or write ennumerated types 
	to the screen!!! Is this so in 4.0?? I know you can change
	types, but what a pain. 


-- 
Richard Brooks      {allegra, gatech, ihnp4, linus, raybed2}!rayssd!rayssdb!rxb
Raytheon Service Company              // When everyone is out to get you  //
Portsmouth, Rhode Island 	     // Paranoia is just good thinking ! //