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December 18, 2015 12:49
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Here's a Ruby version of RPN calculator.
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| class RPNCalculator | |
| def evaluate(str) | |
| ary = [] | |
| str.split.each do |i| | |
| if i.match(/\d/) | |
| ary << i.to_i | |
| elsif i.match(/\-|\+|\*/) | |
| operator = i.to_sym | |
| ary << ary.pop(2).inject(operator) | |
| end | |
| end | |
| return ary.join.to_i | |
| end | |
| end | |
| calc = RPNCalculator.new | |
| calc.evaluate('70 10 4 + 5 * -') # => 0 |
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WHY DOES iT iNDENT iT SO AWFULLY