When using strict (which is a good thing), declaring variables happens like this: 
my $count;

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Technically, you've initialised a variable, not declared it. Doing both at the same time: 
my $count = 0.0;

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Update: This link may prove helpful.
Declaring variables

In reply to Re^3: Floating point number counting script stuck in a loop by dwu
in thread Floating point number counting script stuck in a loop by Vonunov

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