词法分析器即词法分析程序又称为扫描器，其功能在于依次扫视字符串形式源程序中的各个字符，逐个识别出其中的单词，并将其转换为内部编码形式的单词符号串作确为输出-Lexical analyzer that lexical analysis program, also known as scanner, its function is to sweep a string followed by the various characters in the form of the source progra