结构体内嵌函数指针

#include<stdio.h>
void say(int age)
{
    printf("我%d岁了\n",age);
}
struct student
{
    int age;
    char name[10];
    int isman;
    void (*say)(int age);
};
void init(struct student *app)
{
    app->say=say;        
}
void main()
{
    struct  student zhangsan;
    init(&zhangsan);
    zhangsan.age=10;
    zhangsan.isman=1;
    zhangsan.say(zhangsan.age);                              
}