这是一个简单的算符优先的语法分析程序。从文件输入文法规则以后，能够判断文法规则是否为算符优先的，并构造算符优先关系表，然后由用户输入一段合法的句子，然后对这个句子进行规约。-This is a simple operator precedence parser. From file input grammar rules, grammar rules can determine whether the operator precedence, and construct the operator precedence table for a legal sentence, and then entered by the user, then this sentence Statute.