in reply to warnings and strict -- The 2 Best Ways You Can Improve Your Programming

I think your example is really poor. If I just added a line 
    my $text = "Ratio Change:  %7.4f => %7.4f\n", $ratio0, $ratio1;

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to my code (or replacing another one), and then my output shows 
    Ratio Change:  %7.4f => %7.4f

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I don't need a warning to know what is wrong.

In Section Meditations