- 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
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"
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for example:
"//[***]\n1***2***3" should return 6
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Allow multiple delimiters like this: "//[delim1][delim2]\n"
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for example:
"//[*][%]\n1*2%3" should return 6.
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Make sure you can also handle multiple delimiters with length longer than one char
- String Calculator Kata on Roy Osherove blog