#include <stdio.h>
struct info
{
    int age;
    char name[20];
} Info;

struct student
{
    struct info info;
    int score;
    void (*display)(struct student *s);
};

void introduce(struct student *s)
{
    printf("Hello,I am %s.\n", s->info.name);
    printf("I am %d years old.\n", s->info.age);
    printf("My score is %d.\n", s->score);
}

int main(int argc, char const *argv[])
{
    struct student s =
        {
            18, "Mary", 89};

    struct student *pStu = &s;
    pStu->display = introduce;
    pStu->display(pStu);

    return 0;
}

结果：
Hello,I am Mary
I am 18 years old
My score is 89