用书上的代码拼凑的，还是很有成就感的哈
支持的运算符号有"+","-","*","/","(",")","#"。支持的运算符号有"+","-","*","/","
阅读背景：
表达式求值 数据结构 C/C++ 栈的应用
来源：互联网
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