struct是结构体，不是函数

struct studenttype stu;
scanf(%d, stu.number);
stu.name = (char *)malloc(100);
scanf(%s, stu.name);
scanf(%s, stu.sex);
scanf(%d-%d-%d, stu.birthday.year, stu.birthday.month, stu.birthday.day);
scanf(%f, stu.score);