#!/usr/bin/perl
use strict;
use warnings;
my $variable = 10;
my $reference = \$variable;
print( "\$variable = $variable\n" );
print( "\$reference = $reference\n" );
print( "\$\$reference = $$reference\n" );
$variable++;
print( "\$variable = $variable\n" );
print( "\$reference = $reference\n" );
print( "\$\$reference = $$reference\n" );