[Haskell-beginners] having trouble with helloworld style program

[Michael Snoyman]

On Mon, Aug 8, 2011 at 2:39 PM, Sunil S Nandihalli
<sunil.nandihalli at gmail.com> wrote:
> Hello everybody,
>  All I want to do in the following code is to read  an integer from stdin
> and print it back to stdout. Can somebody help me fix my code snippet
> below..
> Thanks,
> Sunil
>
> module Main where
> import Prelude
> stringToInt::String->Int
> stringToInt str = read str
> main =
>     do x<-getLine
>        y<-stringToInt x
>        print y
>
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>

The code is *almost* right. You just need to change the second to last
line to be:

    let y = stringToInt x

Hoping someone else steps in with a good, beginner-friendly
explanation of *why*.

Michael