一个具体的词法分析程序,从输入的源程序中，识别出各个具有独立意义的单词，即基本保留字、标识符、常数、运算符、分隔符五大类。并依次输出各个单词的内部编码及单词符号自身值。（遇到错误时可显示“Error”，然后跳过错误部分继续显示）-a specific lexical analysis procedures, imported from the source to identify all the independent significance of the word, that is to retain the basic character identifier, constant, Operators, separated top-five. Output and followed all the internal code words and symbols own words value. (Error is encountered can show that the "Error", and then skip some mistakes continue to show)