#! perl
#  File: application.pl
use strict;
use warnings;

my $code = $ARGV[0] // 0;
printf "In application: result = '%5d' (decimal) or '%016b' (binary)\n", $code, $code;
exit $code;

##</code><code>##

#! perl
#  File: driver.pl
use strict;
use warnings;

my $code   = $ARGV[0] // 0;
my @app    = ('perl', 'application.pl', $code);
my $result = system(@app);
printf "In driver:      result = '%5d' (decimal) or '%016b' (binary)\n", $result, $result;
printf "                >> 8   = '%5d' (decimal) or '%016b' (binary)\n", ($result >> 8), ($result >> 8);

##</code><code>##

perl driver.pl 255

##</code><code>##

In application: result = '  255' (decimal) or '0000000011111111' (binary)
In driver:      result = '65280' (decimal) or '1111111100000000' (binary)
                >> 8   = '  255' (decimal) or '0000000011111111' (binary)

##</code><code>##

my $result = system(@app);