课程设计PL0

代码说明：

说明：  编译原理的课程设计,对PL0程序的修改与扩充,内附测试程序,即以.PL0为扩展名的文件,编译完后将生成以.COD为后缀的文件(compiler theory of curriculum design, right PL0 process of revising and expanding, enclosing testing procedures that is. PL0 extension of the paper, after the compiler will generate a. COD suffix for the paper)