自己在在做该实验之前，先对其作了系统的学习与分析，在此基础上进行了以下实验扩展：在界面上进行了适当的布局，应用了可视化界面，而不是命令行方式。添加了选择文件的功能代替手工输入源程序，有保存文件功能和打开文件功能。增加预处理的功能，例如去掉注释，文件包含的解释功能，例如/*……*/的识别。识别出更多的常数与符号，比如对转义字符的识别，小数的识别更加准确，进行了诸如1.22.333.44非常数化的识别。-Themselves in doing the experiment before their systematic study and analysis, on the basis of the expansion of the following experiment: In the interface to conduct an appropriate layout, the application of the visualization interface, rather than command-line mode . Added a function to select a file to replace manual input source, and save the file to open the file functions and features. Increase in pretreatment features, such as removal of the Notes, the document contains the interpretation of features, such as/* ... ...*/identification. Identify more constant and symbols, such as escape characters for identification, a small number of more accurate identification, a very few, such as 1.22.333.44 of identification.