I'm mobile and can't spot or test your problem.
Normally I recommend replacing given/when with for/if-constructs.
But in this particular case I don't understand why you are not simply using an array or a hash, holding the number's names.
( addicted to the Perl Programming Language)
Ehm... did you activate switch?
use feature "switch"; or use 5.010;
DB<103> @num=qw/Zero One Two Three Four/
=> ("Zero", "One", "Two", "Three", "Four")
DB<104> $var=2; print "$var is $num[$var]";
2 is Two
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