Its because you're not really following :)
#!/usr/bin/perl -w
use strict;
sub hanoi {
warn "invoked @_";
my ($n, $start, $end, $extra) = @_;
if ($n == 1) {
warn "Move disk #1 from $start to $end.";
} else {
hanoi($n-1, $start, $extra, $end);
warn "Move disk #$n from $start to $end.";
hanoi($n-1, $extra, $end, $start);
}
}
hanoi(3, 'A', 'C', 'B');
__END__
invoked 3 A C B at hanoisub.pl line 5.
invoked 2 A B C at hanoisub.pl line 5.
invoked 1 A C B at hanoisub.pl line 5.
Move disk #1 from A to C. at hanoisub.pl line 8.
Move disk #2 from A to B. at hanoisub.pl line 11.
invoked 1 C B A at hanoisub.pl line 5.
Move disk #1 from C to B. at hanoisub.pl line 8.
Move disk #3 from A to C. at hanoisub.pl line 11.
invoked 2 B C A at hanoisub.pl line 5.
invoked 1 B A C at hanoisub.pl line 5.
Move disk #1 from B to A. at hanoisub.pl line 8.
Move disk #2 from B to C. at hanoisub.pl line 11.
invoked 1 A C B at hanoisub.pl line 5.
Move disk #1 from A to C. at hanoisub.pl line 8.
get it now?
-
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.
|