flex自动生成工具用法

该文章和源码        from :  http://blog.csdn.net/hczhiyue/article/details/20483209

edit ：

  1 /*name : lizi.flex*/
2 %option noyywrap
3 %{
4 int num_lines = 0, num_chars = 0;
5 %}
6 %%
7 \n ++num_lines; ++num_chars;
8 . ++num_chars;
9 %%
10 int main()
11 {
12 yylex();
13 printf("# of lines = %d, # of chars = %d\n", num_lines, num_chars);
14 return 0;
15 }

生成yy.flex.c文件
# flex lizi.flex

complier：

#gcc -g lex.yy.c -o scan

run:

   ./scan <  file.txt