#!/net/perl/5.10.0/bin/perl

use strict;
use warnings;
use List::Util qw(sum);

my $input_file = 'marks.txt';

open my $DATA, '<', $input_file or die "Can't open $input_file: $!\n";

while ( my $line = <$DATA> ) {
    next if $line =~ /^NAME/;
    chomp $line;
    if ( $line =~ /^\w+,\w+(?:,\d+)+$/ ) {
        my ( $first_name, $last_name, @marks ) = split ',', $line;
        my $totalmarks = sum @marks;
        my $average    = sprintf "%.2f", $totalmarks / @marks;
        my $fail       = 0;
        foreach my $mark (@marks) {
            $fail ||= checkfail($mark);
        }
        if ( !$fail ) {
            print "$first_name $last_name\t@marks \t$totalmarks\t$average\n";
        }
        else {
            print "$first_name $last_name\t@marks \t\n";
        }
    }
    else {
        warn "Invalid input: $line\n";
    }
}

close $DATA or die "Can't close $input_file: $!\n";

#To check whether the student failed
sub checkfail {
    my $marks = shift;
    return $marks < 35;
}
john michael	100 50 60 	210	70.00
sam shane	50 60 70 	180	60.00
tom christo	30 40 50