On Mon, Nov 21, 2011 at 11:38, bryan hunt
I'm trying to read in a value and convert it into a number for use in the ageJudge function. I've tried a number of different approaches but keep getting type conversion errors. This is literally my first Haskel program - so please don't laugh...
module Main where
ageJudge :: (Integral a) => a -> String
I'd just skip the type of 'ageJudge' and let the compiler choose itself; it then ends up being "ageJudge :: (Ord a, Num a) => a -> [Char]".
ageJudge age | age >= 40 = "You're too old!" | age <= 30 = "Your too young" | otherwise = "Not in the programming age range.."
main = do putStrLn "What is your name?" name <- getLine putStrLn ("Nice to meet you, " ++ name ++ "!") putStrLn "What is your age?" age <- getLine let inpIntegral = (read age)::Double
"Double" is not an "Integral", you most likely want to use "Int" or "Integer" here. But again, you can just drop the explicit type and let the compiler decide itself.
-- let decission = ageJudge (read inpIntegral)::Integral
"read" takes a String argument, so this line makes very little sense.
putStrLn ("We decided!") -- putStrLn ("We decided:\n" ++ show(1) ++ "!") -- ageJudge inpIntegral
/M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: magnus@therning.org jabber: magnus@therning.org twitter: magthe http://therning.org/magnus