You need to store random generator seed somewhere and keep track of updated value after calling randomness-related functions.
You can try doing it manually, but what really fits here is monad that keeps track of that seed value. Good news is: there is already package with such monad on Hackage. In particular, try package MonadRandom ( http://hackage.haskell.org/cgi-bin/hackage-scripts/package/MonadRandom-0.1.3 ). If you have cabal-install, you can simply get it with "cabal install monadrandom" (and if you don't have cabal-install, you should get this wonderful tool right now!). 

There are some examples within the documentation here:
http://hackage.haskell.org/packages/archive/MonadRandom/0.1.3/doc/html/Control-Monad-Random.html#1

All best

Christopher Skrzętnicki

On Wed, Jan 28, 2009 at 04:33, Erick González <erickgc@instec.cu> wrote:
Hi:
Haskell' s way of random number generation is strange to me, but I know how to do that. I' d like to know how can I call random numbers generated on the screen inside a classic function. I mean, I need to know the way of calling random numbers (one different every time that I run) inside a function. Please, Could anybody help me?
Thanks 

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