This procedure is used for LL (1) method of syntax analysis, LL (1) methods of analysis are top-down approach. Top-down analysis of the basic idea is: For any input string, trying to use all possible means, from the grammar start symbol (root node) proceed from top to bottom as the input string to establish a syntax tree. From the derivation of the point of view, it is starting from the grammar start symbol and repeatedly using a variety of productions to find the derivation of the input string matches. Before you enter must be to carry out the grammar is not LL (1) grammar, the judge, and then construct the corresponding LL (1) Analysis of the table to use predictive analysis method of syntax analysis, based on the following grammar and analysis of the table to the design process to achieve predictable analysis of the analysis.

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