Hi gaurav,
...it should return the reverse of whatever the list has been entered by the user...

True if and only if the user didn't enter all the list on a single line on the CLI. Because with that the array will only have one "value". See what I mean below, using a modified toolic example.

use warnings;
use strict;

print "Enter some lines, then press Ctrl-D:\n"; # or maybe Ctrl-Z
my @lines = <STDIN>;
my @reverse_lines = reverse (@lines);
print @reverse_lines;

__END__

Enter some lines, then press Ctrl-D:
1 2 3   # entered by the user
1 2 3   # printed back
[download]