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The unary minus (-) and unary plus (+) are the same operators as binary minus and plus.
一元减号(-)和一元加号(+)与二元加号和减号都是相同的运算符。
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What is the difference between the unary minus operator and the binary subtraction operator?
一元操作符负号和二元操作符减号的区别是什么？
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