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Answers and rating deltas for

Why do I need to parenthesize x and y in this define?

Author Votes Δ
Keith Thompson 3 +0.91
Mooing Duck 1 +0.10
Igor 0 -1.51
Austin Mullins 0 -0.62
AllenKll 0 -1.54
Last visited: May 1, 2015, 9:42:53 PM