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Não percebi bem a tua dúvida. Se é em relação a que funções existem para isso, tens para escrever para o ecrã por exemplo putStr ou putStrLn, a segunda faz o mesmo que a primeira mas no fim muda de linha. Para ler o que utilizador escreveu podes usar getLine.

Exemplo simples:

main = do
   putStrLn "Qual é o seu nome?"
   nome <- getLine
   putStrLn ("Olá " ++ nome ++" e adeus...")

"Give a man a fish and he will eat for a day; Teach a man to fish and he will eat for a lifetime. The moral? READ THE MANUAL !"

Sign on a computer system consultant's desk

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