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Answers and rating deltas for

What does plus equals(+=) operator means here?

Author Votes Δ
Farhad Jabiyev 1 +3.57
NValchev 0 -1.30
Waqas Shabbir 0 -1.17
vengets 0 -1.11
Last visited: Sep 14, 2014, 5:07:29 AM