编译课程设计，FOR语句的简单优先分析，程序功能强大，能针对任意简单优先文法，自动识别生成简单优先矩阵。可以支持FOR的无限嵌套，四元式地址输出。-Compiler design courses, FOR priority analysis of a simple statement, the program is powerful and can be a priority for arbitrary simple grammar, automatic identification of pr