|Non-declared Variables firstname.lastname@example.org (Avatar) (2006-10-16)|
|Re: Non-declared Variables email@example.com (Wolfram Fenske) (2006-10-17)|
|Re: Non-declared Variables firstname.lastname@example.org (2006-10-24)|
|Re: Non-declared Variables Peter_Flass@Yahoo.com (Peter Flass) (2006-10-26)|
|Re: Non-declared Variables email@example.com (Pascal Bourguignon) (2006-10-28)|
|Re: Non-declared Variables ArarghMail610@Arargh.com (2006-10-28)|
|Re: Non-declared Variables firstname.lastname@example.org (Gene Wirchenko) (2007-01-28)|
|From:||Gene Wirchenko <email@example.com>|
|Date:||28 Jan 2007 01:40:15 -0500|
|Organization:||Posted via Supernews, http://www.supernews.com|
|References:||06-10-064 06-10-098 06-10-109 06-10-120|
|Posted-Date:||28 Jan 2007 01:40:15 EST|
>On 26 Oct 2006 00:28:58 -0400, Peter Flass <Peter_Flass@Yahoo.com>
>>> 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.
In VB6, you can set this to be included in any new program file. I
always used it.
>[BASIC never required declarations, even for arrays. -John]
It sure did. If you did not declare, then you got a default size
of 10 in each dimension of the first use.
[Hey, people wrote lotsa student Basic programs with 10x10 arrays. If you
needed something bigger, which happened less than you might expect, then
you had to DIM them. -John]
Return to the
Search the comp.compilers archives again.