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。
In postfix notation, the need for parentheses is eliminated and the priority of the operators is no longer relevant. You can use the following algorithm to evaluate postfix expressions.
在后缀表达式中，不需要括号，而且操作符的优先级也不再起作用了。
Postfix operators interact poorly with semicolon inference.
后缀运算符互动不佳，分号推理。
This is the opposite of the infix to postfix translation algorithm, where operators were stored on the stack.
和中缀转换后缀的算法相反，那是把操作符存储在栈里。
This is the opposite of the infix to postfix translation algorithm, where operators were stored on the stack.
和中缀转换后缀的算法相反，那是把操作符存储在栈里。
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