[Coco] What are the rules for naming basic09 variables ?

[coco at jechar.ca]

On 2019-07-27 19:01, Gene Heskett wrote:
> On Saturday 27 July 2019 04:44:14 Gene Heskett wrote:
> 
>> On Friday 26 July 2019 16:21:58 Wayne Campbell wrote:
>> > Up to 29 characters, 0-9, a-z, A-Z, _
>> 
>> I think its 28 active, to make room for the terminating zero of the
>> string.
>> 
> I was mistaken, it is 29, with D7 set in the last character, high bit 
> set
> IOW.
>> > $ only if a string variable, only as last character of the variable
>> > name. Not sure, but I think first character has to be a letter?
>> >
Actually I was surprised to see that even 40 characters is not too many 
and
that two variables can be distinguished I tried several things and made 
comments
out of the errors. See listing below. Add to it as you like and re-post.

PROCEDURE vname
(* Development test program *)
DIM TI:STRING
(* DIM ti:STRING cannot be declared as basic09 is case insensitive &  TI 
is *)
(* already declared *)
DIM is_variable_is_long_to_distinguish_fromB:STRING
DIM is_variable_is_long_to_distinguish_fromA:STRING
(*  DIM 1llegal_starts_with_numeric:STRING *)                            
     *)
DIM legalALPHA_NUMER1C:STRING
(* DIM String$ilegal:STRING results in ERROR 33 *)
DIM legal$:STRING
is_variable_is_long_to_distinguish_fromB="A"
is_variable_is_long_to_distinguish_fromA="B"
(* 456789X123456789X123456789X123456789X = 40 Characters WOW  *)
PRINT
PRINT is_variable_is_long_to_distinguish_fromB
PRINT "CORRECT !!"
PRINT is_variable_is_long_to_distinguish_fromA
PRINT "CORRECT WOW !!"
PRINT "DONE"
END


Charlie

>> > Wayne
>> >
>> > On Fri, Jul 26, 2019, 1:00 PM <coco at jechar.ca> wrote:
>> > >   I have seen examples of variable names 10 or 11 characters long
>> > > and of the $ being used in a
>> > >   variable name.
>> > >
>> > >   So I know that alpha numeric and $ are legal components and at
>> > > least 10 characters long but I cannot
>> > >   find the explicit rules so for example is underscore a legal
>> > > variable name component, what is the
>> > >   maximum number of characters  in a variable and are they all
>> > > used or for example would
>> > >   VARIABLE1 be the same as VARIABLE2 because first eight
>> > > characters are all the same ?
>> > >
>> > >   Only answer what you know for sure. I could always try writing a
>> > > bunch of test programs to
>> > >   come up with the rules experimentally but perhaps someone knows
>> > > the exact restrictions on basic09
>> > >   variable naming ?
>> > >
>> > >   Charles
>> > >
>> > > --
>> > > Coco mailing list
>> > > Coco at maltedmedia.com
>> > > https://pairlist5.pair.net/mailman/listinfo/coco
>> 
>> Cheers, Gene Heskett
>> --
>> "There are four boxes to be used in defense of liberty:
>>  soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author)
>> If we desire respect for the law, we must first make the law
>> respectable. - Louis D. Brandeis
>> Genes Web page <http://geneslinuxbox.net:6309/gene>
> 
> 
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> If we desire respect for the law, we must first make the law 
> respectable.
>  - Louis D. Brandeis
> Genes Web page <http://geneslinuxbox.net:6309/gene>