in reply to Argument "" isn't numeric in division (/)

both arguments should be numeric, check the numerator too.

  DB<2> use warnings; ""/3
Argument "" isn't numeric in division (/) at (eval 10)[C:/Perl_64/lib/
+perl5db.pl:646] line 2.

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Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

update

Laurent_R++ for correction: numerator <-> denominator

In Section Seekers of Perl Wisdom