C lang 语法错误缺少“;” 前 ”*”

Question

The error appears in the List* next line.错误出现在List* next行。

typedef struct {
    List* next;
    int data;
    int index;
} List;

Answer 1

As noted in comments, the type List is not known when you use it.如评论中所述，使用List时类型未知。 There are two solutions to this.有两种解决方案。

The first is to simply use struct List *next :第一个是简单地使用struct List *next ：

typedef struct List {
   int n;
   struct List *next;
} List;

The other is to typedef List into existence before defining struct List .另一种是在定义struct List之前typedef List存在。

typedef struct List List;

struct List {
   int n;
   List *next;
};

Which is better is opinion, and thus inappropriate for SO.哪个更好的是意见，因此不适合 SO。