From: Brian Candler <b.candler@...>
Date: 2011-08-09T21:46:08+09:00
Subject: Re: need help to run my first program

eman a. wrote in post #1015678:
> but what about the code which written in the interactive ruby.
> is that write in the one file .rb if yes, how can i find it.
>
> and if i need to write .rb file containing some code and need to run it
> uding my installion to ruby 1.8.7. what can i do?

They're two different ways to run code.

(1) Start irb. Type in Ruby expressions. They are executed immediately


$ irb
irb(main):001:0> 2 + 3
=> 5
irb(main):002:0> 3.times { puts "hello" }
hello
hello
hello
=> 3

This is the best way for experimenting with Ruby or testing out some 
feature you've just learned, as if there's an error you can just hit 
cursor-up and edit/rerun the line.


(2) Open a text editor (even notepad will do), write some ruby in it. 
Save it, with extension .rb. Then run it

$ ruby myprog.rb

This will run all the code in the file. This is the best way to write a 
larger program.

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