Haskell: writing the result of a computation to file
- by peterwkc
I have a function which creates a tuple after computation, but I would like to write it to file.
I know how to write to a file using writeFile, but do not know how to combine the computation and monads IO together in the type signature.
This is my code.
invest :: ([Char]->Int->Int->([Char], Int) )
-> [Char]->Int->Int->([Char], Int)
invest myinvest x y = myinvest x y
myinvest :: [Char]->Int->Int->([Char], Int)
myinvest w x y
| y > 0 = (w, x + y)
| otherwise = error "Invest amount must greater than zero"
where
I have a function which computes the maximum value from a list, but I want this function to receive input from a file, and then perform the computation of maximum value.
maximuminvest :: (Ord a) => [a] -> a
maximuminvest [] = error "Empty Invest Amount List"
maximuminvest [x] = x
maximuminvest (x:xs)
| x > maxTail = x
| otherwise = maxTail
where maxTail = maximuminvest xs
Please help.
Thanks.
