(C) struct member reference-& gt; (arrow) and. (point), member arrow

(C) Structure member reference-> (arrow) and. (point), member arrow

The reference of struct members has the following rule:

Arrow (->): the pointer must be left;
Point (.): The object must be on the left.

So if a struct pointer references a member and the member is a struct (and an entity), what should we do if we want to reference the member?

After the experiment, we found that the above rule is still followed: the pointer must be on the left of the arrow, and the object must be referenced with a point number. For example C-> student. age

Eg.

Start with the arrow c-> s1-> age

#include "stdio.h"int main(){    struct student{        int age;        int class_;    };    struct class2{        struct student s1;    };    struct class2 *c;    struct class2 cc={    .s1={        .age=9,        .class_=2    }    };    c=&cc;    printf("%d",c->s1->age);    return 0;}

The following error occurs:

If you change the code to c-> s1.age, the Code is as follows:

#include "stdio.h"int main(){    struct student{        int age;        int class_;    };    struct class2{        struct student s1;    };    struct class2 *c;    struct class2 cc={    .s1={        .age=9,        .class_=2    }    };    c=&cc;    printf("%d",c->s1.age);    return 0;}

The compilation result is obtained: