Hi monkers, Iam back with a struggle trying to subtract elements from two columns and different rows in a array. I have my TSV file as input that has two of my columns. and want to subtract the 0th value of my 2nd column with the 1st value of the 1st column. then again go on subtracting this this way till the end of the column. I tried to put the data into two array and applied the subtraction operator but i am getting error as "use of uninitialized value in subtraction" and there is no output in my file but the size has increased. The code i used is below, and i have no idea where i went wrong! please help. 
open (FILE, 'probe_dist.tsv');
open (OFILE,'>probe_sum.tsv');
while (<FILE>)
{
    my @a;
    my @b;
    ($a,$b)=split ("\t");
    $a=@a;
    $b=@b;
    my $c;
    my $d;
    my $c=1;
    my $d=0;
    my $e=$b[$d]-$a[$c];
    $c++;
    $d++;
    print OFILE "$e\n";
    
}

[download]
my input file looks like this 
4775792 4775851
4775842    4775901
4775852    4775911
4775902    4775961
4775952    4776011
4776002    4776061
4776052    4776111
4776102    4776161
4776212    4776271
4776252    4776311
4776302    4776361
4776352    4776411

[download]

In reply to use of uninitialized value by rocketperl

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