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Create a simple String calculator with a method int Add(string numbers)
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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”
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Start with the simplest test case of an empty string and move to 1 and two numbers
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Remember to solve things as simply as possible so that you force yourself to write tests you did not think about
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Remember to refactor after each passing test
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Allow the Add method to handle an unknown amount of numbers
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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
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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
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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