use strict;
use warnings;

my $x = very_important_number_calculation();
printf "Your very important value is $x\n";

# time passes ...
my $x = temporary_value();
my $y = temporary_value();
printf "(x + y) = ($x + $y) = ", $x + $y;

# more time passes ...
print "Your very important number calculation yielded:  $x\n";