Converting infix expression to a postfix expression.
中缀表达式到后缀表达式的转换。
If you could not pop two operators, the syntax of the postfix expression was not correct.
如果您不能够弹出两个操作数，后缀表达式的语法就不正确。
Evaluating a postfix expression is simpler than directly evaluating an infix expression.
对后缀表达式求值比直接对中缀表达式求值简单。
How is the postfix and prefix increment operator evaluated in an expression?
后缀和前缀增量运算符表达式中的评价如何？
How is the postfix and prefix increment operator evaluated in an expression?
后缀和前缀增量运算符表达式中的评价如何？
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