From: 7stud -- <lists@...>
Date: 2012-09-07T14:26:22+09:00
Subject: Re: Doing math in Ruby

>Yet, all that did was return the first number of the equation.

===
to_i(base=10) → integer

Returns the result of interpreting leading characters in str as an 
integer base base (between 2 and 36). Extraneous characters past the end 
of a valid number are ignored. If there is not a valid number at the 
start of str, 0 is returned.
===


puts "1abc".to_i
puts "abc1".to_i

--output:--
1
0

What you are trying to do is more complicated.  You have to examine each 
character in the string and try to decide what it is: a number or an 
operator.

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