本函数是一个词法分析器，其分析主要从几个方面入手：

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* 1.先判别是不是注释。一旦读入的字符出现 / * ，则用一个while循环一直读取下面的字符，直到出现* /为止。

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* 2.接着判断是不是以数值开头的。如果是以数值开头则再分情况讨论：

* A.在遇到空格之前，后面读进来的都是数值的话，则很明显，这是一个数。然后将其种别码输出来（37，-）

* B.在遇到空格之前，后面读进来的都是数值的话，譬如123ac 那么这是一个非法字符，输出错误-This function is a lexical analyzer, its analysis mainly from the aspects:** 1. Discriminant is not the first comment. Once read into the character appears/*, it has been using a while loop to read the following characters until*/date.** 2. And then judge is beginning to value. If the value is based on the situation at the beginning of the discussion is further divided into:* A. Prior to encounter a space, followed by reading the values are entered, then obviously, this is a number. And then other kinds of code output (37,-)* B. Prior to encounter a space, followed by reading the words of the incoming values are, for example, 123ac then it is an illegal character, output error