Created: 2012-03-26 03:00
Updated: 2014-03-17 21:10


  1. Create a simple String calculator with a method Add(numbers) that takes a string
  • 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
  1. Allow the Add method to handle an unknown amount of numbers
  2. 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
  • Make sure you only test for correct inputs. there is no need to test for invalid inputs
  1. Allow the Add method to handle a different delimiter:
  • 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
  1. 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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