Hi there,
First of all, I would say thank you very much for all who helped me during
the past days.
Since I am a beginner , sometime I spent even several hours to solve a
very simple problem.So, I still need your help in the future.
The problem is:
********************************************************
import Random
uni :: IO () -> Float
uni = do
xs <- newStdGen
let
m = (head (randoms xs) :: Float )
doubleit :: Float -> Float
doubleit n = 2.0*n
main = print (doubleit uni)
********************************************************
The result is:
bash-2.05$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 5.02.2, for Haskell
98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package std ... linking ... done.
Prelude> :cd test
Prelude> :l random.ls
can't find module `random.ls'
Prelude> :l random.hs
Compiling Main ( random.hs, interpreted )
random.hs:11: The last statement in a 'do' construct must be an expression
Failed, modules loaded: none.
Prelude>
*******************************************************
What is wrong with it?
Thank you very much.
Kevin
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