#include <stdio.h>
#include <stddef.h>

#define container_of(ptr, type, member) ({                 \
    const typeof(((type *)0)->member) *__mptr = (ptr);     \
    (type *)((char *)__mptr - offsetof(type, member));      \
})

struct student_s
{
    char    name[50];
    int     age;
};

void print_student(int *p_age)
{
    struct student_s    *p_student;

    // 使用 container_of 获取指向 student_s 结构体的指针
    p_student = container_of(p_age, struct student_s, age);

    printf("Name: %s, Age: %d\n", p_student->name, p_student->age);

    return ;
}

int main(void)
{
    struct student_s    student = {"Zhang San", 30};

    print_student(&student.age);

    return 0;
}