Read the postfix expression from left to right.
从左到右读入后缀表达式
Converting infix expression to a postfix expression.
中缀表达式到后缀表达式的转换。
At the end of the postfix expression, pop a result from the stack.
到后缀表达式末尾，从堆栈中弹出结果。
If the postfix expression was correctly formed, the stack should be empty.
若后缀表达式格式正确，那么堆栈应该为空。
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？
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。
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。
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