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CalculatorWhat We're Looking For
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CheezItMan
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Feb 11, 2018
| def parse(input) | ||
| # Removes white space, converts string into an array split by the possible operators (but retaining the operators). | ||
| # Removes empty strings from the array. I'm actually not sure where these are coming from, but I noticed them when the user enters a negative number. | ||
| parsed_input = input.gsub(/\s+/,"").split(/(\+)|(-)|(\*)|(\/)|(\^)|(%)|(add)|(subtract)|(multiply)|(divide)|(exponent)|(modulo)/).reject { |x| x.empty? } |
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Nice regular expression to split the input string.
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| # Informs user of the limits of the calculator, the possible operators, and prompts user for their calculation. | ||
| puts "Welcome to my (very limited) calculator. This calculator can perform basic arithmetic operations between two numbers." | ||
| puts "\nThe accepted operators are: +, -, *, /, ^, or %, or the words add, subtract, multiply, divide, exponent, or modulo." |
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I would suggest an example of valid input. At first I was entering just the operator (-,+,/,*, etc).
| puts "Hmm. It doesn't look like the operation you've entered is valid for this calculator." | ||
| # If the array length is less than 3, the user likely didn't enter enough information, | ||
| # or didn't enter it in a manner that the parser could handle. Returns nil. | ||
| elsif (parsed_array[0] =~ /^[-+]?\d+(\.\d+)?$/).nil? || (parsed_array[2] =~ /^[-+]?\d+(\.\d+)?$/).nil? |
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Nice regular expression, I would suggest to use /^[-+]?\d*(\.\d+)?$/ instead of what you have there. Yours requires at least 1 digit to the left of the decimal so .25 wouldn't work.
| parsed_input[3] = parsed_input[2..3].join | ||
| parsed_input.slice!(2) | ||
| end | ||
| return parsed_input |
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