my @array_of_unformatted_numbers = (
    2, 5.3, 56.789,
);

my @array_of_formatted_numbers = map {
    sprintf( "%0.2d", $_ )
} @array_of_unformatted_numbers;

foreach my $formatted_number ( @array_of_formatted_numbers ) {
    print "The formatted number is $formatted_number.\n";
}