算符优先分析过程模拟，通过对文件的读取，构造链表，将文法和分析表存入链表，然后输入符号串与#号结束并执行操作-Operator priority simulation analysis, through to read the document, list structure, grammar, and analytical tables will be deposited into the list, then enter the# symbol with the end of string and the implementation of the operation