me@UbuntuMachine: ./test2.pl 
Use of uninitialized value in concatenation (.) or string at ./test2.pl line 14.
decimal places: 
decimal places: 3
Use of uninitialized value $second_part in numeric gt (>) at ./test2.pl line 19.
done

me@UbuntuMachine: ./test3.pl 
decimal places: 
decimal places: 3
done

me@SciLnxMachine: ./test2.pl 
Use of implicit split to @_ is deprecated at ./test2.pl line 19.
Use of uninitialized value in length at ./test2.pl line 14.
decimal places: 0
decimal places: 3
Use of uninitialized value $second_part in length at ./test2.pl line 19.
done

me@SciLnxMachine: ./test3.pl 
decimal places: 0
decimal places: 3
done