使用空格将二元操作符与它的操作数分开。
Use whitespace to help binary operators stand out from their operands.
中给出了成员和非成员二元操作符的良好例子。
The Sales item class offers a good example of member and nonmember binary operators .
一元操作符负号和二元操作符减号的区别是什么？
What is the difference between the unary minus operator and the binary subtraction operator?
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