I have a basic script which parses and processes a set of .tmp input files:

my $extension = '.txt';
my @files = glob("*.tmp");
for my $file (@files) { 
    open IN, '<', $file or die "$!";
    $file =~ s/\..*//;
    my $outfile = $file.$extension;
    open OUT, '>', $outfile or die "$!";
    while (<IN>) {
        next unless $. > 45;
        chomp $_;
        our(@F) = split(' ', $_, 0);
        @array = split(m[[:,/]+], $F[9], 0);
        $check = index($F[4],',');
        if ($check == '-1') {
            $ratio = $array[3] / $array[4]; 
            print OUT "$F[0]\t$F[1]\t$F[3]\t$F[4]\t$ratio\t$array[4]\n
+";
        }
        elsif ($check > 0) {
            @allele = split(',', $F[4]);
            $ratio1 = $array[3] / $array[5]; 
            $ratio2 = $array[4] / $array[5]; 
            print OUT "$F[0]\t$F[1]\t$F[3]\t$allele[0]\t$ratio1\t$arra
+y[5]\n$F[0]\t$F[1]\t$F[3]\t$allele[1]\t$ratio2\t$array[5]\n";
        }
    }
}

[download]

However upon running it, I am receiving the error:

Illegal division by zero at /file/pathway/script.pl line 15 <IN> line 37864

Why is this occurring and how can it be fixed?

Line 37864 is the final line+1 in the first input file (i.e. it's attempting to process an empty line), so I have a feeling that it is due to the fact that in a couple of instances I am splitting one input line into two output lines (see Line 22) and this is offsetting $. but I am not sure.

In reply to Illegal division by zero error by TJCooper

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