#!/Perl/bin/perl -w

use strict;
use IO::File;

use constant{KB => 2**10,
             MB => 2**20,
             GB => 2**30};


print "Enter the pathname and filename of the file to split: ";
my $filename = <STDIN>;


my $valid_block_type;
my $block_size;
my $block_type;

until($valid_block_type)
{
    print "Enter the block size \n (example: 400KB,10MB,1GB): ";
    $block_size = <STDIN>;

    chomp($block_size);

    $block_size =~ m{([a-zA-Z]{2}$)};
    $block_type = $1;


    BLOCK_TYPE:
    {
        $block_type eq 'KB' && do{$block_type = KB;    
                      $valid_block_type = 1;
                      last BLOCK_TYPE;};

        $block_type eq 'MB' && do{$block_type = MB;
                      $valid_block_type = 1;
                      last BLOCK_TYPE;};

        $block_type eq 'GB' && do{$block_type = GB;
                      $valid_block_type = 1;
                      last BLOCK_TYPE;};

        DEFAULT_BLOCK_TYPE: {print "Invalid block type specified!\n\n"
+;}
    }
}
[download]

Generates the following warning msg. the line numbers correspond to the regex checks in the code block.

Use of uninitialized value in string eq at C:\Documents and Settings\x
+xx\Desktop
\deasm.pl line 32, <STDIN> line 3.
Use of uninitialized value in string eq at C:\Documents and Settings\x
+xx\Desktop
\deasm.pl line 36, <STDIN> line 3.
Use of uninitialized value in string eq at C:\Documents and Settings\x
+xx\Desktop
\deasm.pl line 40, <STDIN> line 3.
[download]

I understand that Perl wants me to decalre these strings in variables and reference them that way... but can someone explain why this is a bad practice?

20030728 Edit by Corion: Retitled as per authors intention

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