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Re: Use of a global scalar

by friedo (Prior)
on Sep 02, 2006 at 21:49 UTC ( #570892=note: print w/replies, xml ) Need Help??


in reply to Use of a global scalar

Using our within a block makes the variable a package global only within that block. To make the global valid throughout the entire file, simple put our $text at the top. You're also re-declaring $text inside your while loop each time and then matching it, which doesn't make sense, and should result in a "Use of uninitialized value in substitution" warning.

However, it's good practice to avoid global variables when possible. Instead, you can do something like this:

use strict; use warnings; use Data::Dumper; sub load_file { my $file = shift; my $text; { local $/; open my $fh, $file or die "Can't open $file $!"; $text = <$fh>; } return $text; } my $text = load_file( '/home/greyfox/data/TBLLOTUSNOTESPYRAMID.txt' );

Then, you can pass $text as a parameter to a subroutine that processes the second file, for example.

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Re^2: Use of a global scalar
by betterworld (Curate) on Sep 03, 2006 at 02:22 UTC
    You're also re-declaring $text inside your while loop each time and then matching it, which doesn't make sense, and should result in a "Use of uninitialized value in substitution" warning.
    This is not true. An our-variable is declared only for the current block, but it's the same variable every time you declare it. The following code works fine:
    use strict; use warnings; { our $text = 'test'; } { our $text =~ s/t/T/; } { print our $text; # "Test" }
    However I can't tell why Grey Fox's code doesn't work. He should have provided the input files.

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