#!/usr/bin/perl

use strict;
use warnings;

my $variable = 10;
my $reference = \$variable;

print( "\$variable = $variable\n" );
print( "\$reference = $reference\n" );
print( "\$\$reference = $$reference\n" );
$$reference++;
print( "\$variable = $variable\n" );
print( "\$reference = $reference\n" );
print( "\$\$reference = $$reference\n" );