okay.. going back over my old code with use warnings, use strict, and use diagnostics, i'm getting a few errors i don't understand. All of them are referring to the same misunderstanding, so i'll only post the first error: 
Argument "" isn't numeric in addition (+) at perlcomplex.txt line 151 
+(#1)
    (W numeric) The indicated string was fed as an argument to an oper
+ator
    that expected a numeric value instead.  If you're fortunate the me
+ssage
    will identify which operator was so unfortunate.

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to this error, i say "duh"
What i'm doing is taking numbers out of a string, and then adding them, and then putting them back into a string. So, when i take them out of the string as substrings, they are still of type string. But! I thought perl didn't separate type String and type Integer.. all are type Scalar.. and without the use strict, this works as intended.
What am i doing wrong?

In reply to "" isn't numeric... by moltar512

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