Hi Monks,
I wrote the following perl script to calculate the total marks, percentage and the pass/fail status of the students list. Here i have to calculate the rank of the students. Your suggestions to approach this will be helpful at this point of time.

student.pl
----------
#!/usr/bin/perl

use strict;
use warnings;

open(FILE, "marks.txt") || die("cannot access the file");
my($fullname,$markseachsubject,$totalmarks,$percentage,@marks,@total,$
+marks,$status,@rank,$mark,$value,%records);
while(my $line=<FILE>){    
    next if $line=~/^NAME/;
    chomp($line);
    $line=~/(\w+),(\w+),(\d+),(\d+),(\d+)/;
        $fullname=$1." ".$2;
        push(@marks,$3,$4,$5); 
        foreach $mark(@marks){
           $status=checkpass($mark);
        }
        $markseachsubject=$3." ".$4." ".$5." ".$status; 
    $totalmarks=$3+$4+$5;
        @total=$totalmarks;
        $percentage=$totalmarks/3;                          $percentag
+e=sprintf("%.2f",$percentage);
        if($status eq "Pass"){ 
           print $fullname." "."\t".$markseachsubject." "."\t".$totalm
+arks." "."\t".$percentage;
        print "\n";
        }else{
           print $fullname." "."\t".$markseachsubject." "."\t";
           print "\n"; 
        }  
        
}

#To check whether the student is pass or fail
sub checkpass{
    $marks=shift;
    if ($marks > 35){
      $status="Pass";
      return $status; 
    }else{
      $status="Fail";
      return $status;
     }
}


close FILE;
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My input file is:

marks.txt
----------
NAME:SURNAME:MARK1:MARK2:MARK3
john,michael,100,50,60
sam,shane,50,60,70
tom,christo,30,40,50
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Thanks all for your help