输入身份证号，输出出生日期

课本例题

#include<stdio.h>
int main()
{
    int year, month, day;
    printf("请输入身份证号码：\n");
    scanf_s("%*6d%4d%2d%2d%*d", &year, &month, &day);
    printf("%4d-%02d-%02d", year, month, day);
    return 0;
}