From: Josh Cheek <josh.cheek@...>
Date: 2012-09-07T15:51:38+09:00
Subject: Re: Doing math in Ruby

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On Thu, Sep 6, 2012 at 8:52 PM, Jon M. <lists@ruby-forum.com> wrote:

> Hello everybody. I am new to Ruby and understand the bare minimum of
> basic concepts. I was wondering if there was a way to take the input of
> a user (supposedly a mathematical equation) and return the answer. For
> example, if I started the Ruby script in my Terminal, is there a way
> that I would be able to type in 1+2 and get a returned answer of 3?
> Something I tried was:
>
> puts "Enter Equation"
> answervar = gets.chomp
> doneans = answervar.to_i
> puts doneans
>
> Yet, all that did was return the first number of the equation. Any help
> or advice would be greatly appreciated. Thanks!
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

If it's just a tool for you to use, then I'd just eval the inputs (does
constrain the syntax a bit, though)

If you want to take in user input, then you'll need to do some kind of
parsing of the input. A quick search found
http://lukaszwrobel.pl/blog/math-parser-part-4-tests which looks pretty
simple, but might work. Otherwise, try searching through rubygems.org and
ruby-toolbox.com

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On Thu, Sep 6, 2012 at 8:52 PM, Jon M. <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-forum.com</a>&gt;</s=
pan> wrote:<br><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello everybody. I am new to Ruby and understand the bare minimum of<br>
basic concepts. I was wondering if there was a way to take the input of<br>
a user (supposedly a mathematical equation) and return the answer. For<br>
example, if I started the Ruby script in my Terminal, is there a way<br>
that I would be able to type in 1+2 and get a returned answer of 3?<br>
Something I tried was:<br>
<br>
puts &quot;Enter Equation&quot;<br>
answervar =3D gets.chomp<br>
doneans =3D answervar.to_i<br>
puts doneans<br>
<br>
Yet, all that did was return the first number of the equation. Any help<br>
or advice would be greatly appreciated. Thanks!<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
--<br>
Posted via <a href=3D"http://www.ruby-forum.com/" target=3D"_blank">http://=
www.ruby-forum.com/</a>.<br>
<br>
</font></span></blockquote></div><br><br>If it&#39;s just a tool for you to=
 use, then I&#39;d just eval the inputs (does constrain the syntax a bit, t=
hough)<br><br>If you want to take in user input, then you&#39;ll need to do=
 some kind of parsing of the input. A quick search found <a href=3D"http://=
lukaszwrobel.pl/blog/math-parser-part-4-tests">http://lukaszwrobel.pl/blog/=
math-parser-part-4-tests</a> which looks pretty simple, but might work. Oth=
erwise, try searching through <a href=3D"http://rubygems.org">rubygems.org<=
/a> and <a href=3D"http://ruby-toolbox.com">ruby-toolbox.com</a><br>

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