More general: how to convert number n to base b.

1. b^k ≤ n; find k; k = floor( log_bn )
2. t * b^k ≤ n; find t; t = floor( n/b^k )
3. put sign nr. t from your base at end of resulting string, there must be exactly b signs in the base array.
4. set n = n - t * b^k
5. go to step 1 or finish if n = 0

in other words:

sub decimalToX {
    my $number = shift or return $_[0];
    my $base = @_;
    my $logbase = log $base;
    my $string = '';

    my $power = int(log($number)/$logbase);

    while($number){

        my $f = $base ** $power;
        my $times = int($number/$f);

        $string .= $_[$times];
        $number -= $times * $f;

    } continue {
        --$power
    }

    $string . $_[0] x ($power+1)
}
print decimaltoX( 5 , qw/0 1/ ); # 101
[download]

--
http://fruiture.de

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.