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use strict;
use warnings;
...
    $bin_val = sprintf('0x%x', $dec_val) if($dec_val); 
    print "Bin value $temp_reference_value[$i] and Hex value is $bin_v
+al \n"; 
}

Integer overflow in octal number at bintohex.pl line 11.
Octal number > 037777777777 non-portable at bintohex.pl line 11.
...
Integer overflow in octal number at bintohex.pl line 11.
Octal number > 037777777777 non-portable at bintohex.pl line 11.
Bin value 1111111111111111111111111111111 and Hex value is 0xffffffff