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ruby-expression-parser 0.9.1-5
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# Taken from http://lukaszwrobel.pl/blog/math-parser-part-3-implementation
require 'rubygems'
require 'expression_parser'

parser = ExpressionParser::Parser.new

loop do
  begin
    print '>> '
    puts parser.parse(gets)
  rescue RuntimeError
    puts 'Error occured: ' + $!
  end
end