说明：  对于任意输入的一个LL(1)文法，构造预测分析程序，输出输入串的自动匹配过程。首先实现集合FIRST(X)构造算法和集合FOLLOW(A)构造算法，再实现预测分析表构造算法。再构造预测分析程序，输出字符串的自动匹配过程。
(For any input of a LL (1) grammar, structure prediction analysis program, import and export series of automatic matching process. First of all, to achieve set FIRST (X) construction algorithm and the set FOLLOW (A) construction algorithm, and then to achieve forecast of the table construction algorithm. Prediction of re-construction process, the output string of automatic matching process.)