Your data has empty fields, I suppose they are meant to signify zero. So add this after unpacking.° 
$inc += 0;
$exp += 0;

[download]
 Another interpretation is your data is corrupted.

That's why you get this warning, because Perl can't know what your real intentions are.

Please note how accurate the warning is, it gives you the data line and the code line...

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

Update

°) I just realized that since you are using unpack you get an empty string not undef (like a regex would).

Hence adding 0 will continue giving you a warning.

So better use the $inc ||= 0 approach here, like AnoMonk suggested

In reply to Re: use warnings is complaining by LanX
in thread use warnings is complaining by Anonymous Monk

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