程序代码：

#include <stdio.h>
#include <stdlib.h>
struct birthday
{
    int year;
    int month;
    int day;
}
struct student
{
    int studentid;
    char name[10];
    char sex;
    struct birthday dob;
    float score;
} a={1,"李四",'m',{1993,12,3},95.5};
int main()
{
    printf("学号:%d\n,姓名：%s\n,性别:%c\n,出生日期%d-%d-%d\n,成绩：%f\n",a.studentid,a.name,a.sex,a.dob.year,a.dob.month,a.dob.day,a.score);
    return 0;
}

程序代码：

#include <stdio.h>
#include <stdlib.h>
struct birthday
{
    int year;
    int month;
    int day;
}//这里少了个分号；
struct student
{
    int studentid;
    char name[10];
    char sex;
    struct birthday dob;
    float score;
} a={1,"李四",'m',{1993,12,3},95.5};
int main()
{
    printf("学号:%d\n,姓名：%s\n,性别:%c\n,出生日期%d-%d-%d\n,成绩：%f\n",a.studentid,a.name,a.sex,a.dob.year,a.dob.month,a.dob.day,a.score);//逗号放到\n前面会好看点
    return 0;
}