ch04.031_prob

来自「Perl Best Practices the source code」· 031_PROB 代码 · 共 32 行

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 4 of "Perl Best Practices"  ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;

my %margin;

use constant {
    LINES_PER_PAGE => 42,
    MAX_LINES      => 60,
}; 
 
# and later...
 
$margin{LINES_PER_PAGE}               # sets $margin{'LINES_PER_PAGE'}
    = MAX_LINES - LINES_PER_PAGE;


use Data::Dumper 'Dumper';
warn Dumper [ \%margin ];