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OrderingのMonoid実装を使って書いたじゃんけんです>ω< unsafeInterleaveIOを使ってどうにか動くようにしてみました>< もっとうまい方法を知っていたら教えていただけると幸いですm(_ _)m
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import Control.Monad | |
import Data.Monoid | |
import System.IO | |
import System.Random | |
data Janken = Guu|Choki|Paa deriving (Show, Read, Eq, Enum) | |
instance Ord Janken where | |
Guu `compare` Choki = LT | |
Choki `compare` Paa = LT | |
Paa `compare` Guu = LT | |
l `compare` r | |
|l == r = EQ | |
|otherwise = GT | |
janken :: IO Ordering | |
janken = do | |
putStrLn "Janken Pon!" | |
you <- prompt "you > " >>= return . read :: IO Janken | |
cpu <- getStdRandom (randomR (0, 2)) >>= return . (!!) [Guu .. Paa] | |
putStrLn $ "cpu > " ++ show cpu | |
(return $ you `compare` cpu) `mappendM` (unsafeInterleaveIO $ putStrLn "Draw" >> janken) | |
where | |
prompt xs = putStr xs >> hFlush stdout >> getLine | |
mappendM = liftM2 mappend | |
main = do | |
res <- janken | |
case res of | |
LT -> putStrLn "Win!" | |
GT -> putStrLn "Loss!" |
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