Compiler

说明：  LL(1)文法和预测分析方法 1.文法使用产生式来定义； 2.分别求出文法中每一个非终结符的FIRST集、FOLLOW集和SELECT集； 3.画出预测分析表； 4.判定给定的文法是否是LL(1)文法； 5.给定符号串判定是否是文法中的句子，分析过程用分析表格的方式打印出来。(LL(1) Grammar and Predictive Analysis 1. Grammar is defined by production. 2. Find out the FIRST set, FOLLOW set and SELECT set of each non-terminator in grammar. 3. Draw a forecast analysis table. 4. Determine whether a given grammar is LL(1) grammar; 5. Given a string of symbols to determine whether it is a sentence in grammar, the analysis process is printed out in the form of an analysis table.)