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Answers and rating deltas for

What is this code block doing ? (u > 0) - (u < 0)

Author Votes Δ
Eugene Sh. 8 +0.47
VHarisop 5 +1.30
fukanchik 2 -2.44
gibertoni 2 -2.33
Last visited: Jan 2, 2016, 2:19:49 PM