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if ($root_beer) {
  printf("A float: %12.4f$/", $root_beer);
} else {
  printf("A float: %12s$/", '');
}

my $root_beer_str = $root_beer || ''; # change 0 to blank.
$root_beer_str &&= sprintf("%12.4f", $root_beer);
printf("A float: %12s$/", $root_beer_str);