I have been work my way through "Haskell The Craft of Functional
Programming", all was fine until IO (chapter 18). That is causing me
bafflement.
I am trying to write a totally trivial program that reads a series of
integers from the console until it gets a zero, then returns the series
of integers as a list.
I am down to randomly editing my code, never a good sign. Any clues
would be appreciated, My code so far, which clear doesn't work, is:
getInt :: IO Int
getInt = do
putStr "Enter number (zero to quit)"
line <- getLine
return (read line :: Int)
anIntList :: [Int]
anIntList =
do
let n = getInt
if n == 0
then return []
else return (n : anIntList)
ps: even a simple version that returns an Int i can't get to work.
anInt :: Int
anInt = do
n <- getInt
return n
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