Generate 8bit dec to hex to bin chart.pl

Alteeve Wiki :: How To :: Generate 8bit dec to hex to bin chart.pl

A short script that generates a byte-length chart of decimal to hexadecimal to binary values.

#!/usr/bin/perl
# Author:  Madison Kelly; mkelly@alteeve.com
# Date:    Jun. 21, 2010
# License: GPLv2

# Be clean
use strict;
use warnings;

# Headers
print " Dec. | Hex.  | Binary\n";
print "------+-------+-----------\n";
foreach my $dec (0..255)
{
        # Convert the decimal to hexadecimal and pad the result with a leading
        # zero if needed.
        my $hex = sprintf("%x", $dec);
        $hex=length($hex) == 1 ? "0".$hex : $hex;

        # Adapted from: http://docstore.mik.ua/orelly/perl/cookbook/ch02_05.htm
        # Convert the decimal to a network-byte value then back to a bit-by-bit
        # value. This generates a longer string than I want, so regex out the
        # last two nibbles and put them back together with a space to make it
        # more readable.
        my $bin=unpack("B32", pack("N", $dec));
        my ($l, $r)=($bin=~/(\d{4})(\d{4})$/);
        $bin="$l $r";

        # Pad the decimal value with spaced to right-justify the value and then
        # print the three values.
        $dec=length($dec) == 1 ? "  ".$dec : length($dec) == 2 ? " ".$dec : $dec;
        print " $dec  |  $hex   | $bin\n";
}
print "------+-------+-----------\n";

exit;

 

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