Another "Silly use for Perl" entry.
Anonymous Monk asked for a method for incrementing mixed letters and numbers recently, which particular need is satisfied with Math::Base36. Can we do better? I guess, yes.
use 5.10.0;
use Math::Base;
my $begin = Math::Base->new(36, 1009, 1); # base, number, is_encoded
my $end = Math::Base->new(36, 1020, 1);
my $c = Math::Base->new(36, 42);
say $c->encode($_) for $begin .. $end;
# 1009
# 100A
# 100B
# 100C
# ...
# 101X
# 101Y
# 101Z
# 1020
# also (with updated code below)
# my $x = Math::Base->new(36, 46664); # 1008 in base36
# say ++$x for 0..63; # output same as above
# Arithmetics with different encodings:
$p = Math::Base->new(8,777,1); # decimal 511
$z = Math::Base->new(36, 35); # 'Z' as base36
say $z * $p; # 42735 (octal)
say $p * $z; # 'DST' (base36)
# Changing the string representation:
$s = Math::Base->new(16,18);
say $s; # 12
$s->rebase(18);
say $s; # 10
$s += 3; # 13
$s->rebase(2);
say $s; # 10101
# Get decimal value:
$xyz = Math::Base->new(64, 'XYZabc', 1);
say $xyz->num; # 36013230438
Far from complete, but fun enough yet. For me, that is... ;-)
Update: Below is an updated version which handles negative numbers, implements missing operators and lets you define your own charset for baseX conversion, e.g. to calculate base3 with qw(a b c). Also, a method integer() is added which emulates use integer globally for all calculations, and some utility methods/functions.
Update: fixed some bugs
I'll eventually make it into a CPAN package proper.
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.