用C语言采用模拟DFA算法编写一个扫描器（词法分析器）用来识别：

由任意个a或b开始后接aa再自加或自减1的字符串，即正规式r=(a|b)*aa(+|-)1描述的语言L（r）。

-Simulated DFA algorithm in C language to write a scanner (lexical analyzer) is used to identify: followed by any one of a or b aa longer self plus or decrement a string, the regular expression r = (a | b )* aa (+ |-) 1 described in the language L (r).