Stuart A. Kurtz schreef op 10-5-2014 18:02:
Dear Roelof,
Thanks , it's working now like this :
loop :: Int -> IO () loop n = do if n <= 100 then do putStrLn (show n ); putChar ' '; putStrLn (show (n * n )) ; loop (n + 1); else return () ;
main :: IO () main = loop 1
But the outcome looks like this:
1 1 2 4 You're getting good advice, but this strikes me as extraordinarily unidiomatic Haskell -- it reads like a translated C program. Fixing it doesn't eliminate that sense.
Why not this?
main :: IO () main = putStr . unlines . map (unwords . map show . (\n -> [n,n^2])) $ [1..100]
Peace,
Stu
Like I said to another person . Im now following this course: https://www.fpcomplete.com/school/starting-with-haskell/basics-of-haskell But I get the feeling it's not a good one. Maybe find another tutorial/course where I can learn it the right way and do a lot of exercises so I can see if I understand things right. I learn the best by doing things and not only read about it. Roelof