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Answers and rating deltas for

Why does the java code give following output?

Author Votes Δ
devrobf 2 +1.74
Grijesh Chauhan 1 -1.38
Ruchira Gayan Ranaweera 1 +0.10
Suresh Atta 1 -0.46
Last visited: Sep 14, 2014, 5:07:29 AM