编译原理词法和语法分析，体内容是产生一个二元式文本文件，扩展名为dyd，可将Pascal程序(测试程序)分解成为一个一个的单词，并查“单词符号与种别对照表”得出其种别，用一数字表示，范围1-56（52-56分别对应保留字integer、real、boolean、char）。-compiler theory morphology and syntax analysis, body is a dual-generated text files, dyd the extension can be Pascal procedure (test procedures) as a decomposition of a word. and investigated the "words and symbols of other kinds of control" to its classification, with a figure, 1 -56 range (52-56 respectively corresponding to retain the word integer, real, boolean, char).