构造函数的分类

#include<iostream>

using namespace std;

class Date

{

public:

void hh(int year, int month, int day)

{

_year = year;

_month = month;

_day = day;

}

void Display()

{

cout << "year" << _year << endl;

cout << "month" << _month << endl;

cout << "day" << _day << endl;

}

Date(int year, int month, int day)

{

cout << "Date:带参数的构造函数" << endl;

_year = year;

_month = month;

_day = day;

}

Date(int year )

{

cout << "Date:带缺省值构造函数" << endl;

_year =2015 ;

_month = 8;

_day = 17;

}

Date()

{

cout << "无参构造函数" << endl;

_year = 2013;

_month = 8;

_day = 17;

}

private:

int _year;

int _month;

int _day;

};

int main()

{

//Date p1(2015, 8, 17);

//p1.Display();

//Date p2(2015);

//p2.Display();

Date p3;

p3.Display();