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https://github.com/seankilleen/stringcalculatorkata

## String Calculator Kata Implementation
https://github.com/seankilleen/stringcalculatorkata

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## String Calculator Kata Implementation

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# StringCalculatorKata Implementation

Katas are normally meant to be something that are thrown away, but for the sake of example, I'll be completing the StringCalculator kata, [as described by Roy Osherove](http://osherove.com/tdd-kata-1/).

The requirements, undertaken one at a time, are as follows (saved from Roy's post for posterity):

* Create a simple String calculator with a method int Add(string numbers)
* The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example “” or “1” or “1,2”
* Start with the simplest test case of an empty string and move to 1 and two numbers
* Remember to solve things as simply as possible so that you force yourself to write tests you did not think about
* Remember to refactor after each passing test
* Allow the Add method to handle an unknown amount of numbers
* Allow the Add method to handle new lines between numbers (instead of commas).
* the following input is ok: “1\n2,3” (will equal 6)
* the following input is NOT ok: “1,\n” (not need to prove it - just clarifying)
* Support different delimiters
* to change a delimiter, the beginning of the string will contain a separate line that looks like this: “//[delimiter]\n[numbers…]”
* for example “//;\n1;2” should return three where the default delimiter is ‘;’ .
* the first line is optional. all existing scenarios should still be supported
* Calling Add with a negative number will throw an exception “negatives not allowed” - and the negative that was passed.if there are multiple negatives, show all of them in the exception message

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Stop here if you are a beginner. Continue if you can finish the steps so far in less than 30 minutes.
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* Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2
* Delimiters can be of any length with the following format: “//[delimiter]\n” for example: “//[***]\n1***2***3” should return 6
* Allow multiple delimiters like this: “//[delim1][delim2]\n” for example “//[*][%]\n1*2%3” should return 6.
* make sure you can also handle multiple delimiters with length longer than one char