一个词法分析程序，对所给出的程序可分析出关键字、数字（整数、小数、科学计数法数字）、定义的识别符、分界符、分隔符 ，并带有lex程序。-A lexical analysis program, the program is proposed to analysis of keyword, digital ( integer, decimal, scientific notation definition digital ), identifiers, delimiters, separator, and with lex procedures.