Hello, I partly solved the problem of cis194 of turning 123 into [1,2,3] But I ran into a problem I cannot solve . When I have this : toDigits :: Integer -> [Integer] toDigits n | n < 0 = [] | n == 0 = [] | otherwise = toDigits (n `div` 10) ++ [n `mod` 10] toDigits 123 gives [ 1,2,3] but toDigits 0 gives [] where I expect to be [0] So I change the code to this : toDigits :: Integer -> [Integer] toDigits n | n < 0 = [] | n == 0 = [0] | otherwise = toDigits (n `div` 10) ++ [n `mod` 10] Now toDigits 0 gives [ 0] but toDigits 123 gives now [ 0, 1 ,2, 3] where I expect to be [1,2,3] Can someone give me a tip how to solve this I have asked this on the beginners ML but the only answer I get was someone who was using some if -then statement and I think I can be solved without. Roelof