The result of the postfix increment expression is not a variable, but a value.
后+ +符表达式的结果是个值而不是一个变量。
Reverse, for example, must be able to decrement its arguments as well as increment them; it USES the expression — last.
举个例子,Reverse,必须能够像递减一样地递增;它使用这个表达式—last。
Expression statement or statements to increment or decrement the loop counters.
用于递增或递减循环计数器的一条或多条表达式语句。
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