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Re: Worst thing you ever made with Perl

by jeffa (Chancellor)
on Sep 28, 2003 at 23:06 UTC ( #294826=note: print w/ replies, xml ) Need Help??


in reply to Worst thing you ever made with Perl

Took a while to dig up ... i think i wrote this in early 1997:

#!/usr/local/bin/perl ################################################# # hanoi.pl # translated from C++ to Perl by Jeff Anderson # original C++ code by Brenda Parker ################################################# #recursive function sub Hanoi { local($number, $from, $to, $aux); ($number, $from, $to, $aux) = @_; if ($number == 1) { print "Move 1 from $from to $to<BR>"; } elsif ($number != 0) { &Hanoi($number-1,$from,$aux,$to); print "Move $number from $from to $to<BR>"; &Hanoi($number-1,$aux,$to,$from); } } #this library contains the function &GetFormInput which reads #and parses the form data require('libs/forms-lib.pl'); #read input from the form %input = &GetFormInput(); print "Content-type: text/html\n\n"; $number = $input{'pegs'}; unless ($number =~ /^[0-1]?[0-9]$/) { print "Numeric, not alpha-numeric!<BR>"; exit; } print <<"EOM"; <HTML> <HEAD> <TITLE>Towers Result</TITLE> </HEAD> <BODY> EOM if ($number < 1) { print "You are really cruel, zero pegs. Go away.<BR>"; } elsif ($number > 15) { print "I said 15 is the max, go tie up your own processor!<BR>"; } else { print "For $number pegs:<P>"; &Hanoi($number,'A','B','C'); } print <<"EOM"; </BODY> </HTML> EOM

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)


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2Re: Worst thing you ever made with Perl
by jeffa (Chancellor) on Sep 28, 2003 at 23:29 UTC
    And now, the re-write:
    use strict; use warnings; use CGI qw(header param); use HTML::Template; my @solution; my $tmpl = HTML::Template->new(filehandle => \*DATA); if (param('go')) { my $discs = param('discs'); $discs = 1 if $discs < 1 or $discs > 15; hanoi($discs,'A','B','C'); $tmpl->param( solution => \@solution, discs => $discs, ); } print header, $tmpl->output; # original algorithm learned from Brenda Parker sub hanoi { my ($number, $from, $to, $aux) = @_; if ($number == 1) { push @solution, {step => "Move 1 from $from to $to"}; } elsif ($number != 0) { hanoi($number-1,$from,$aux,$to); push @solution, {step => "Move $number from $from to $to"}; hanoi($number-1,$aux,$to,$from); } } __DATA__ <html> <head> <title>Towers of Hanoi</title> </head> <body> <form> <p> Enter number of discs desired (15 is MAX): <input type="text" name="discs" size="2" /> </p> <input type="submit" name="go" value="Solve" /> </form> <tmpl_if solution> <hr/> Solving for <tmpl_var discs> discs: <ol> <tmpl_loop solution> <li><tmpl_var step></li> </tmpl_loop> </ol> </tmpl_if> </body> </html>

    jeffa

    L-LL-L--L-LL-L--L-LL-L--
    -R--R-RR-R--R-RR-R--R-RR
    B--B--B--B--B--B--B--B--
    H---H---H---H---H---H---
    (the triplet paradiddle with high-hat)
    

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