gistfile1.rb

class Numeric
  @@currencies = {'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
 
  def method_missing(method_id)
    singular_currency = method_id.to_s.gsub( /s$/, '')
    if @@currencies.has_key?(singular_currency)
      self * @@currencies[singular_currency]
    else
      super
    end
  end
  def in(curSymbol)
    if (curSymbol.class == Symbol)
      singularCurrencyString = curSymbol.to_s.gsub(/s$/, '')
      if @@currencies.has_key?(singularCurrencyString)
         self * 1 / (@@currencies[singularCurrencyString])
      elsif (singularCurrencyString == 'dollar')
        return self
      else
        super        
      end
    end
  end
end