关于类中类成员的初始化

关于类中类成员的初始化

student类添加一个date类数据成员birthday，date类包含三个数据成员：year、month、day，以及用于初始化的构造函数，用于输入数据的input和输出数据的output成员函数。student类构造函数需要完成birthday的数据初始化

#include <iostream>
using namespace std;
class Data
{
public:
	Data(int n, int y, int r) { this->n = n; this->y = y; this->r = r; }
	void input(Data& a) { cout << "请输入年月日：" << endl; cin >> a.n >> a.y >> a.r; }
	void output(Data& a) { cout << "该学生 生日年月日为\t" << a.n << '\t' << a.y << '\t' << a.r << endl; }

private:
	int n, y, r;
};
class Student
{
public:
	Student(string name, int id, double score, int n, int y, int r):birth(n,y,r){ this->name = name; this->id = id; this->score = score;  }
	void input() { birth.input(birth); }
	void output() { birth.output(birth); }
private:
	string name;
	int id;
	double score;
	Data birth;
};
int main()
{
	Student S("a", 88, 99, 2002, 2, 24);
	S.output();
	S.input();
	S.output();
}