99. 有如下程序：
#include<iostream>
#include<string>
using namespace std;
class Person{
public:
Person(string n):name(n) { cout<<'1' ; }
private:
string name;
};
class Date{
public:
Date(int y=2012):year(y) { cout<<'2'; }
private:
int year;
};
class Student:public Person{
public:
Student(string n, int y, char c):birthday(y), sex(c), Person(n) { cout<<'3'; }
private:
Date birthday;
char sex;
};
int main(){
Student stu1("321",2002,'2');
return 0;
}
运行时的输出结果是______。
