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Answers and rating deltas for

How can I use while statement to determine whether the input is invalid?

Author Votes Δ
Hugo Sousa 0 -0.07
A Boschman 0 +0.08
Philippe Gioseffi 0 +0.01
massi 0 -0.02
Last visited: Sep 14, 2014, 5:07:29 AM