实现数据结构中的数学中序表达式转换为后继表达式. 并且运算出后序表达式的结果.

运算符号包括

+ - * / & | ! ( )

加 减 乘 除 与 或 非-Implementation data structure in the math expression in the sequence is converted to a subsequent expression. And after computing the result of the expression sequence. Computing symbols include+-*/&　|! () Addition and subtraction or multiplication and division with