实验一词法分析1.实验目的：掌握简单识别程序的分析、设计与实现的基本技术与一般方法。

2.实验内容：假设某种语言标识符由下划线或字母开头的字母数串，编写它的识别程序。对它的其所有字符进行逐个判断，分别输出标识符和非标识符。

3.实验步骤：

(1)分析：

程序输入一个字符串，对它的其所有字符进行逐个判断，分别输出标识符和非标识符。

-Analisis words about identify the chars1 experiment: analysis, design and implementation of basic technology and general method to grasp the simple recognition program.2 experiment: suppose a language identifier from the beginning or underlined letters of the alphabet number string, write it identification procedures. Its all its characters one by one judge, respectively output identifier and non identifier.3 experimental procedures:(1) analysis:Program input a string, it all its characters one by one judge, respectively output identifier and non identifier.