If you use warnings;, you will get a warning: 
Argument "five" isn't numeric in addition (+) at try.pl line 6.

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You will not get a warning for doing string comparison on a number, though.
Caution: Contents may have been coded under pressure.

In reply to Re^2: Handling both string and numeric comparisons by Roy Johnson
in thread Handling both string and numeric comparisons by perl_devel

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