Talk:Casting out nines: Difference between revisions
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:::I'd like to see a different title for the task. The current description states right up front that the task is not casting out nines. —[[User:Sonia|Sonia]] 19:46, 26 June 2012 (UTC)
::::OK, maybe you have misunderstood what I am trying to convey. Following Dr. Math at http://mathforum.org/library/drmath/view/55926.html describing casting out nines to the phrase "(You wouldn't normally get the same check digit for the result of the sum and the products; I just picked a weird example.)" I see that every Kaprekar is a "weird example". Using Dr. Maths "quick explanation of how to do it, without the big words" would be as slow as the String C++ Kaprekar solution. So we turn to http://mathworld.wolfram.com/CastingOutNines.html. What is said there is true for bases other than 10, therefore it is possible to develop a fast test. --[[User:Nigel Galloway|Nigel Galloway]] 12:47, 27 June 2012 (UTC)
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