Hello, I'm new to haskell and want to write a small program for some winder calcucations. I want to input 10-15 values and based on this input doing some calculations. After this calculations I want to print out the results. My problem is: How can I get the input values into the calculations and back the result to the output. In an other language I would use global variables for this. So what should I use in haskell? An other point is that I want to separate the input from the calculations and the output. How can I achieve this with haskell? Modules? Data types? See some pseudo code below. inputvalues :: IO() inputvalues = do hSetBuffering stdout NoBuffering putStr "Berechnung Bremsgenerator \n\n" ve <- readNum "Bitte Maschinengeschwindigkeit (m/min) angeben: " de <- readNum "Bitte Durchmesser der vollen Rolle eingeben (mm): " dewalze <- readNum "Bitte Durchmesser der Walze eingeben (mm): " dewand <- readNum "Bitte Wandstaerke der Walze eingeben (mm): " and so on .............. readNum :: String -> IO Float readNum text = do putStrLn text readLn -- calculations nvr :: Float-> Float-> Float nvr ve de = ve / de /pi *1000 pzugmin :: Float-> Float-> Float->Float pzugmin ve femin be = 1.666 * ve * femin * be * 0.00000001 pzugmax :: Float-> Float-> Float->Float pzugmax ve femax be = 1.666 * ve * femax * be * 0.00000001 and so on .............. outputvalues = do putStr "\n\nErgebnisse Bremsgenerator \n\n" putStr "Drehzahl leere Trommel: " putStr(show(round(nvr))) putStr " U/min \n" putStr "Drehzahl volle Trommel: " putStr(show(round(drehbgmax))) putStr " U/min \n" and so on ...................... Thanks Thomas