[Haskell-cafe] Can type be changed along a >>= chain?
nowgate at yahoo.com
Mon Oct 12 12:53:51 EDT 2009
Dumb! I just figured out I was entering the input string in quotes.
So, I suppose the answer to my question is yes, type CAN be changed along a >>= chain. I was having trouble doing it in a different problem, created this small example to illustrate the problem, and then screwed it up putting quotes around my input string.
--- On Mon, 10/12/09, Niklas Broberg <niklas.broberg at gmail.com> wrote:
From: Niklas Broberg <niklas.broberg at gmail.com>
Subject: Re: [Haskell-cafe] Can type be changed along a >>= chain?
To: "michael rice" <nowgate at yahoo.com>
Cc: haskell-cafe at haskell.org
Date: Monday, October 12, 2009, 12:43 PM
On Mon, Oct 12, 2009 at 6:37 PM, michael rice <nowgate at yahoo.com> wrote:
transform :: IO ()
transform = putStrLn "What is your digit
>>= \str -> return ('9':str)
>>= \str -> return (read str :: Int)
>>= \i -> putStrLn $ "The number is " ++ show i
This code works perfectly for me. What problem are you seeing specifically?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Haskell-Cafe