From: dblack@...
Date: 2006-02-28T23:17:41+09:00
Subject: Re: Pine's book "Learning to Program" - Answer?

Hi --

On Tue, 28 Feb 2006, woodyee wrote:

> Thanks! NOW, I think I get it. Here's my program:
>
> # Write a program which asks for a person's favorite number. Have your
> #program add one to the number, then suggest the result as a bigger and
>
> #better favorite number.
>
>
> puts "What is your favorite number? "
> num = gets.chomp
> better = num.to_i + 1
> puts 'This is a better number: ' + better.to_s + '.'
>
>
> Gregor's solution is compact (good thing) but it's too advanced for me
> now.  :-)
> What is it? Looks like a Python concocted commented out dictionary to
> me...    :-)
> Thanks again!

Gregor is using string interpolation, to insert the expression num + 1
into the output string.  String interpolation works like this:

   "This is a string with #{2 + 2} inside it."

which will print:

   This is a string with 4 inside it.


David

-- 
David A. Black (dblack@wobblini.net)
Ruby Power and Light (http://www.rubypowerandlight.com)

"Ruby for Rails" chapters now available
from Manning Early Access Program! http://www.manning.com/books/black