Hi Barry, Barry Burd wrote:
median :: [Int] -> Int median lst = case medians lst of -- All the values in the result are the same, we just pick the first one x:xs -> x
main = do putStr "Enter a list: " lst <- getLine median lst
I'm sure this is because Haskell isn't automatically changing a String to a List of numbers. But how can I do this?
Use the "read" function. Watch out, though - there is no error checking there. So if the user enters a string that does not have the right syntax for a Haskell list of integers, your program will halt with an error message. You have another problem - you used the "median" function as a step in a do block - but each step in a do block must have type "IO a" for some type a. Here's how you could write your main function: main = do putStr "Enter a list: " lst <- getLine print $ median $ read lst Regards, Yitz