Re: Noob question: Function to prompt for input

The error message is because you have a ";" at the end of the first line followed by a "val".
What you want is something like:

	fun getletter () = let
	      val _ = print "Please enter your guess as a character string: "
	      val SOME ln = TextIO.inputLine TextIO.stdIn
	      in
		String.substring(ln, 0, 4)
	      end;

but note that if the user types in less than four characters, then you are going to get
a Subscript exception.

	- John

On Mar 13, 2010, at 10:59 AM, tommy mato wrote:

> 
> I want to do something simple like create a function that prompts for input.
> In any other language that would be trivial. I have spent 6 hours at this
> today and not getting any closer. I've tried so many combinations.
> 
> Here is my latest version of the function:
> 
> fun getletter _ = (print "Please enter your guess as a character string: ";
> val line = valOf (TextIO.inputLine TextIO.stdIn);
> String.substring(line, 0, 4));
> 
> I get back a meaningless error message:
> 
> outer.sml:1.79 Error: syntax error: replacing SEMICOLON with RPAREN
> 
> Any ideas? Thanks in advance.
> -- 
> View this message in context: http://old.nabble.com/Noob-question%3A-Function-to-prompt-for-input-tp27889172p27889172.html
> Sent from the SML/NJ mailing list archive at Nabble.com.
> 
> 
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