C语言 包含结构的结构

# include <stdio.h>
# include <stdlib.h>

struct data
{
int year;
int month;
int day;
};

struct student
{
char name[30];
int num;
char sex;
struct data birthday;
}student = {"dire",2017,'W',{1990,1,6}};

int main ()
{
printf("--------Information--------\n");
printf("Name:%s\n",student.name);
printf("Number:%d\n",student.num);
printf("Sex:%c\n",student.sex);
printf("Birthday:%d年%d月%d日\n",student.birthday.year,student.birthday.month,student.birthday.day);

return 0;
}