requires explicit package name

[sam]

Hi,

I don;t know what is wrong with the following simple perl code:

#!/usr/bin/perl

use strict;
use warnings;

local %hash1 = ('sales_subtotal'=>100);
local %hash2 = ('sales_subtotal'=>150);


When I execute the above code, I got the following error:
Global symbol "%hash1" requires explicit package name at hashs.pl line 6.
Global symbol "%hash2" requires explicit package name at hashs.pl line 7.


Thanks
Sam

 

[Sherm Pendley]

local %hash1 = ('sales_subtotal'=>100);
local %hash2 = ('sales_subtotal'=>150);

Have a look at "perldoc -f local", especially the first paragraph.

sherm--

 

[sam]

Why do you think you need local() there?






Does this help (from perldoc perlsub)


==============
A `local' just gives temporary values to global (meaning package)
variables. It does *not* create a local variable. This is known as
dynamic scoping.
==============
Yup. thanks

?

 

[Mothra]

use strict;
use warnings;

local %hash1 = ('sales_subtotal'=>100);
local %hash2 = ('sales_subtotal'=>150);


When I execute the above code, I got the following error:
Global symbol "%hash1" requires explicit package name at hashs.pl line 6.
Global symbol "%hash2" requires explicit package name at hashs.pl line 7.

use 'my' to scope a variable:

my %hash1 = ('sales_subtotal'=>100);
my %hash2 = ('sales_subtotal'=>150);

 

[Tad McClellan]

I don;t know what is wrong with the following simple perl code:

See the documentation for the strict pragma. You are
running afoul of the "strict vars" part:

perldoc strict

use strict;

Here you promise to declare all of your variables, or to use the
full package name of the variable...

local %hash1 = ('sales_subtotal'=>100);

.... and here you use a variable doing neither.

You have broken your promise, perl refuses to run your program.


Why are you using package variables instead of lexical variables?

If you can use lexical variables, then you declare them like this:

my %hash1 = ('sales_subtotal'=>100);

If you really do need package variables (unlikely) then you declare
them like this:

our %hash1 = ('sales_subtotal'=>100);

or, you use its full name:

%main::hash1 = ('sales_subtotal'=>100);

When I execute the above code, I got the following error:
Global symbol "%hash1" requires explicit package name at hashs.pl line 6.

All of the messages that perl might issue are documented in

perldoc perldiag

You should look up messages there as a *first* step in troubleshooting:

=item Global symbol "%s" requires explicit package name

(F) You've said "use strict vars", which indicates that all variables
must either be lexically scoped (using "my"), declared beforehand using
"our", or explicitly qualified to say which package the global variable
is in (using "::").


If you don't know what this "package" vs. "lexical" thing is,
then please see:

"Coping with Scoping":

http://perl.plover.com/FAQs/Namespaces.html