[Haskell-cafe] Function Returning Type?
josh.weissbock at gmail.com
Thu May 21 15:11:48 EDT 2009
I wrote this function as I am just learning Haskell. What it does is it
generates a list of all rational numbers between 0 and 1, but I only have it
show the first 20.
rationals n :: Integer -> String
rationals n = (putStr . unlines . map show) (take n (nub [x % y | y <-
[1..], x <- [1..y], x < y]))
Now my problem is the type declaration, the first line. I get the error
"Invalid type signature". I googled this error and I was not able to find
out why it is giving it to me. I have also tried:
rationals n :: Integer -> [Ratio]
but it gives me the same error.
Please someone point me in the right direction. Thanks.
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