我们刚刚学结构体，很多东西不懂，求高手帮我看看下面程序哪里有错，谢谢！
#include <stdio.h>
struct data
{
    int month;
    int day;
    int year;
};
struct student
{
    char name[20];
    int age;
    char sex;
    struct data_birthday;
    char language;
    char department[30];
};
int main()
{
    struct data d1={5,6,1976};
    struct student s1={"LiMing",20,"M",d1,"c","计算机系"};
    printf("%s",&s1);
    return 0;
}
应该怎么改，菜鸟在此拜谢了！嘿嘿！