Read the postfix expression from left to right.
从左到右读入后缀表达式
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 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。
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