说明：  便宜原理实验报告内涵设计流程图,6个实验的实验报告,词法分析,语法分析:ll1 LR 算符优先 中间代码生成 pl/0编译器
(Report of the connotation of the principle of cheap design flow chart of the experiment, six experiments report, lexical analysis, grammar analysis: ll1 LR operator priority code generation between pl/0 compiler)