改代码是编译原理中的预测分析程序，功能很少，仅供大家学习使用。-Change the code in the compiler theory prediction analysis procedures, functions very little for them to learn to use.

UPQC编程代码，仅供大学学习交流，有不足之处还请指教-UPQC programming code, only for university exchanges, there are inadequacies also please advise