c - 什么是标记结构以及它们与普通结构有何不同？

Question

我不明白为什么第二个结构有两个标签 person 和 person_create。第二个结构体如何返回指针。

struct Person{
    char *name;
    int age;
    int height;
    int weight;
};
struct Person *Person_create(char *name,int age,int height,int weight){
    struct Person *who = malloc(sizeof(struct Person));
    assert(who != null);

    who->name = strdup(name);
    who->age = age;
    who->height = height;
    who->weight = weight;
    return who;
};

Answer 1

struct Person *Person_create(char *name,int age,int height,int weight)

阅读此行

Person_create 

是一个函数名，该函数返回一个指向结构体的指针

struct Person *