$; is used as an ordinary variable. It could have been $f. For each character in the string, if zero it is replaced by 3, if 3 it is replaced by 30, thus yielding the sequence 3, 30, 303, 30330, 30330303. Each value is simply the concatenation of the previous two values; for example, 30330303 is 30330 followed by 303. Thus, its length is the sum of the two previous lengths, yielding Fiboncci numbers. If you replace 0's by newborn and 3's by old rabbits you get Fibonacci's model of population growth
-
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.
|
