Re: Non-declared Variables

ArarghMail610@Arargh.com
28 Oct 2006 01:25:11 -0400

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From: ArarghMail610@Arargh.com
Newsgroups: comp.compilers
Date: 28 Oct 2006 01:25:11 -0400
Organization: Ripco Communications Inc.
References: 06-10-064 06-10-098 06-10-109
Keywords: design, comment
Posted-Date: 28 Oct 2006 01:25:11 EDT

On 26 Oct 2006 00:28:58 -0400, Peter Flass <Peter_Flass@Yahoo.com>
wrote:


>gnorik@gmail.com wrote:
>> I don't think that it is a good idea when language definition allows
>> you to use variables without declaration.
>> First of all, it leads to bugs which is rather hard to find.
>
>I would expect the compiler to issue a message for this, unless
>undeclared variables are the norm for this language, as in Rexx. PL/I,
>for example, has language-specified defaults and default rules, but all
>compilers I know of also warn.


MS Basic 16-bit compilers for the most part, didn't.


Come to think of it, I don't think that the 32-bit ones do either.


The exception to that is that some support an "OPTION EXPLICIT" which
causes an error for undeclared variables, when used.
--
ArarghMail610 at [drop the 'http://www.' from ->] http://www.arargh.com
BCET Basic Compiler Page: http://www.arargh.com/basic/index.html
[BASIC never required declarations, even for arrays. -John]

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