From: Tomas Pospisek's Mailing Lists <tpo2@...>
Date: 2007-12-06T07:52:32+09:00
Subject: Re: Lambda funcs that call gets won't halt program execution?

On Thu, 6 Dec 2007, Peter Bunyan wrote:

> Once again, a problem with my Befunge interpreter. I'm trying to
> implement the ~ and & functions - get a character and a number,
> respectively. My & function looks like this:
> instructions["&"] = lambda { print "Number: "; stack.push
> gets().strip.to_i}
>
> But it complains about gets() being nil. as soon as the function is run.
> Well, of course it is. It has let me type. Is there anyway to make it
> halt?

This works for me:

i= {}
s= []
i["&"] = lambda {
   print "Number: "
   s.push( gets().strip.to_i ) }

i['&'].call
puts "Evaluating stack: #{s.pop}"

Gives:

-> Number:
123
-> Evaluating stack: 123

*t

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   Tomas Pospisek
   http://sourcepole.com -  Linux & Open Source Solutions
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