Code:
 #!/usr/bin/perl -w
  
  use strict;
  use FileHandle;
  use warnings;
  my $data = "file.bin";
  my $buffer;
  my $string;
  my $n = 0;
  my $checksum = 0;
  my $num = 0;
  my $str = unpack("B32", pack("N", shift));
  my $bits = 4;
  my $decimal;

open FILE, $data or die $!;
binmode FILE;  
 while (($n = read FILE, $buffer, 4))
 {
 
 $decimal = unpack("N", pack("B32", $buffer));
 
 {$checksum = $checksum + $decimal;
 #$num = $num + $bits;}
 
 #print "1. $num\n";
 print "2. $decimal\n";
 #print "3. $n bytes read\n";
 print "4. $checksum \n";
 }
 
 $checksum = $checksum & 0xFFFFFFFF;