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75 lines
1.5 KiB
75 lines
1.5 KiB
use strict;
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my $iterations = 3000; # How many games to play
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my $verbosity = 0;
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while (@ARGV) {
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my $param = shift @ARGV;
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$verbosity = 1 if $param eq '-v';
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$iterations = int (shift @ARGV) if $param eq '-i';
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}
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sub verbose {
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print $_[0]."\\n" if $verbosity;
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}
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my $stickers;
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my $switchers;
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print "Playing $iterations games...\\n\\n";
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for(1..$iterations) {
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my @items = qw(goat goat prize); # two goats, one prize
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my @door;
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while (@items) { # this puts the @items into the @door array in random order
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push (@door, splice (@items, int rand @items, 1));
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}
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verbose ("Door 0: $door[0]; Door 1: $door[1]; Door 2: $door[2]");
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my $contestant = int rand 3;
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verbose ("Contestant chooses door $contestant.");
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my $monty;
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# If the contestant picked the prize, Monty picks another door by random.
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if ($door[$contestant] eq 'prize') {
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$monty = ($contestant + (int rand 2) + 1) % 3;
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}
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# Otherwise, he picks the other goat.
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else {
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$monty = $door [ ($contestant+1) % 3 ] eq 'goat' ? ($contestant+1) % 3 : ($contestant+2) % 3;
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}
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verbose ("Monty opens door $monty.");
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# Now only two doors are open. If the sticker wins, the switcher loses and vice versa.
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if ($door[$contestant] eq 'prize') {
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verbose ("Sticker wins. Switcher loses.");
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$stickers++;
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} else {
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verbose ("Sticker loses. Switcher wins.");
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$switchers++;
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}
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}
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print "Grand totals:
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Sticker has won $stickers times
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Switcher has won $switchers times
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";
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