my $numerator;
        my $denominator;
      

        if ($indicator eq "SH"){
            $numerator = $last_element;
        } elsif ($indicator eq "SL"){
            $denominator = $last_element;
        } else {
            print "\nError: There has been an unexpected string within
+ the second to last element of the array\n";
        }

[download]
You only ever initialise $numerator or $denominator on the first run through. Something like 
my $numerator = 0;
my $denominator = 0;

[download]
might work, if 0 is a suitable default value for you.

In reply to Re^3: Use of uninitialized value by cjb
in thread Use of uninitialized value by Win

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