Re: [MacPerl] The Powers of Annoy

[miku <miku@onlinehome.de>]

> step 1) People generally are more willing to look at code if it's
> unobfuscated. (unless of course the question is how to make it more
> obfuscated). Below is a nice show of what your scrip should look like.
> step 1b) that also applys to useful variable names. But that's always personal
> preferance, and I haven't looked at the code yet.
> step 2) my comments to answer your question are below as well delimited by
> comment marks
> 
> $f = "54321";
> $fl= length($f);
> $e = 2**$fl-1;
> $" = ", ";
> @o = ($f, "", "");
> print "\n\nThe Towers of Annoy\n\nInitial state: @o\n";
> $y=0;
> $n=0;
> ### above two lines could be ($y, $n) = (0,0);
> until ($n >= $e) {
> chop(@o[$y]);
> $u = $y;
> $y=(($y+1)%3);
> ### $y = ++$y %3;
> ### I'd like to do a ++$y%=3; but unfortunately that doesn't work :)
> $o[$y] .= "1";
> $n++;
> print "Move #$n: @o\n";
> unless ($n >= $e) {
> $p = @o[$u];
> $s = length($p);
> $g = substr($p, $s-1, 1);
> $v = (3-($y+$u));
> ### $v = 3 - $y - $u;
> $r = @o[$v];
> $t = length($r);
> $h = substr($r, $t-1, 1);
> if ($h eq "") {
> chop(@o[$u]);
> @o[$v] .= $g;
> } elsif (($g eq "") || ($h lt $g)) {
> ### } elsif ($g eq '' or $h lt $g) {
> ### also if they're all numerical why not use numerical comparisons?
> chop(@o[$v]);
> @o[$u] .= $h;
> } else {
> chop(@o[$u]);
> @o[$v] .= $g;
> }
> $n++;
> print "Move #$n: @o\n";
> }
> }
> __END__
> 
> le meas,
> --Nick 

Very useful, thank you! I missed the option to do vector assignment [($y,
$n) = (0,0)], but the comparison could not be numerical, as the user could
expand the towers by adding letters like "A", "B", etc. Or would numerical
comparsion still work, then (implicit type conversions taking place?) Yes,
and a tip like "$y = ++$y %3"; is what I was looking for, thanks. Another
way to do it, more compact, less parens. Great.

Michael
> 
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