NO1 拷贝构造函数

#include <iostream>
#include<string.h>


using namespace std;


class CDate
{
private:
    int year,month,day;
public :
    CDate(int y = 1900,int m=1,int d = 1)
    {
        year = y; month = m;day = d;
         cout<<"1.调用日期类的构造函数"<<endl;
    }
    CDate(CDate &s)//拷贝构造函数
    {
        year = s.year;
        month = s.month;
        day = s.day;
        cout<<"2.调用日期类的拷贝构造函数"<<endl;
    }
    ~CDate()
    {
        cout<<"3.调用日期类的析构函数"<<endl;
    }
};
class CStudentID
{
    private : int value;
    public : CStudentID(int i)
    {
        value = i;
        cout<<"4.构造学号"<<value<<endl;
    };
    ~CStudentID()
    {
        cout <<"5.析构学号"<<value <<endl;
    }
};
class CStudent
{
    private :
        string name;
        char sex;
        CStudentID id;
        CDate birthday;
    public:
        CStudent(string,char,int,CDate&);
        ~CStudent();
};
CStudent::CStudent(string na,char s,int i,CDate &d):id(i),birthday(d)
{
    name = na;
    sex = s;
    cout<<"6.调用学生"<<name <<"的构造函数"<<endl;
}
CStudent::~CStudent()
{
    cout<<"7.调用学生"<<name <<"的析构函数"<<endl;
}


int main()
{
    CDate day1(1989,3,1);
    CStudent stud1("张三",'m',2011102,day1);
    return 0;

}

运行结果：