Converting infix expression to a postfix expression.
中缀表达式到后缀表达式的转换。
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。
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。
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。
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