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{-
Reverse Polish Notation
>example
rpn "10 4 3 + 2 * - "
-4.0

rpn "30 4 +"
34.0

rpn "4 3 + 10 *"

taisyo7333

import System.Environment
import System.Directory	-- openTempFile , removeFile
import System.IO	
import Control.Exception -- bracketOnError
import qualified Data.ByteString.Lazy as B
{-
This code is referenced from "Learn You a Haskell for Great Good!!"
-}

main = do

taisyo7333

import System.Environment
import Data.List
{-
>.\arg.exe abc xyz "123 456"
The arguments are:
abc
xyz
123 456
The program name is:
arg.exe

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New-Item -ItemType Directory -Name ディレクトリ名

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import System.Random
-- getStdGen , newStdGen 
-- If you use getStdGen 2 times , you can get the same result.
-- In this case , you can use newStdGen instead of getStdGen after the first time you use getStdGen. 
main = do
     gen <- getStdGen
     putStrLn $ take 20 (randomRs ('a','z') gen )
     gen' <- newStdGen
     putStrLn $ take 20 (randomRs ('a','z') gen' )

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 ghc --make todo.hs