use warnings;
use strict;
use utf8;
local $/ = undef;

open FILE1, "myfile" or die "Couldn't open file: $!";
binmode FILE1;
$string1 = <FILE1>;
close FILE1;

open FILE2, "myfile" or die "Couldn't open file: $!";
binmode FILE2;
$string2 = <FILE2>;
close FILE2;

#and I got stuck here. I am thinking using "for" syntax, couldn't find details. but can anybody help me?