Here is a somewhat shorter version to play with -- it differs in the ordering of the previous guesses (but you can change push() to unshift() to get the original behaviour): 

#!/usr/bin/perl -w
use strict;

# Colors: [y]ellow [b]lue [g]reen [r]ed blac[k] [w]hite

my @colors  = qw/y b g r k w/;
my $pattern = join '', map{@colors[rand @colors]} 1..4;
my @guesses = ();

for my $count (1 .. 11) {
    print "Mastermind!\n";
    print "Colors:[y]ellow [b]lue [g]reen [r]ed blac[k] [w]hite\n";
    print @guesses;
    last if $count > 10;
    chomp(my $guess = <STDIN>);
    print "$pattern\n"  and redo if $guess eq 'showme';
    print "Bad Input\n" and redo unless $guess =~ /^[ybgrkw]{4}$/;
    my $tmp_pat = $pattern;
    my $right_color = grep { $tmp_pat =~ s/$_// } split //, $guess;
    my $right_place =()= "$pattern$guess"=~/(.)(?=...\1)/g;
    $right_color -= $right_place;
    push @guesses, "$count|$guess|$right_place,$right_color\n";
    if ($right_place == 4){
        print "You win!\n";
        exit;
    }
}
print "You lost! Pattern was: $pattern\n";

[download]

Update: chipmunk's shortened version of getting the right_place calculation (in his reply below) caused me wonder about other shortcuts for the same calculation -- here is one: 

my $right_place =()= "$pattern$guess"=~/(.)(?=...\1)/g;

[download]

However, I think we're both crossing the line into obfuscation now rather than simplification. On the other hand, revisiting the code after a little break unveiled a large bug lurking in the code for counting the right colors that aren't in the right place --- the previous code was: 

$right_color += $pattern =~ s/([$guess])/$1/g;
$right_color -= $right_place;

[download]

But that fails to do the right thing under some conditions. I've patched the code above (and thrown in the above shortcut too). But I rather dislike using the tmp variable and destroying it in the grep() call --- I'm sure there's a simpler/cleaner solution but it escapes me at the moment.

In reply to Re: Re: Need help with a Mastermind game by danger
in thread Need help with a Mastermind game by PsionicMan

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