There's no prototype in: 
    sub ration_change;

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That's a (forward) declaration. If you use a prototype, both the declaration, and the definition of the subroutine should have prototypes, and the prototypes should be identical.
Perl --((8:>*

In reply to Re^5: warnings and strict -- The 2 Best Ways You Can Improve Your Programming by Perl Mouse
in thread warnings and strict -- The 2 Best Ways You Can Improve Your Programming by liverpole

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