关于编译原理中文法的讲解，又需要的朋友可以看看，挺好的-build on the principles of law on the Chinese, but it also needs a friend can see, in very good shape;

输入一个文法，可得到文法的FIRST集、FOLLOW集、SELECT集，可以判断文法是否为LL（1）文法，并可求出文法的预测分析表，以及串的自顶向下的分析过程。输出很清晰。-Enter a grammar, the grammar of the FIRST sets available, FOLLOW sets, SELECT set, you can determine whether the grammar LL (1) grammar, and can find the grammar o