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Live Calculator + Math module using ruby and sinatra

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#!/usr/bin/env ruby
require 'sinatra' # gem install sinatra --no-ri --no-rdoc
include Math

set :port, 3000
html = <<-EOT


	
	
EOT get('/'){ html } get '/calc' do begin eval(params['exp']).to_s rescue 'Your expression is invalid' end end
Topics:

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

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