一个满足下边要求的CDate类

#include<iostream>
using namespace std;
class CDate
{
private:
	int m_nDay;
	int m_nMonth;
	int m_nYear;
public:
	CDate();//默认构造函数
	CDate(int, int, int);//重载构造函数
	void Display();//输出日期
	void Adddate();//返回加1后的日期
	void Setdate(int,int,int);//设置日期
	~CDate();//析构函数
private:
	bool Isleapyear();//判断年份是不是闰年
};

CDate::CDate()
{}
CDate::CDate(int year, int month, int day)
{
	m_nDay = day;
	m_nMonth = month;
	m_nYear = year;
}
void CDate::Display()
{
	cout << m_nYear << "年" << m_nMonth << "月" << m_nDay << "日" << endl;
}
void CDate::Adddate()
{
	m_nDay++;
	if (Isleapyear())
	{
		if (m_nMonth == 2 && m_nDay == 30)
		{
			m_nMonth++;
			m_nDay = 1;
			return;
		}
	}
	else
	{
		if (m_nMonth == 2 && m_nDay == 29)
		{
			m_nMonth++;
			m_nDay = 1;
			return;
		}
	}
	if (m_nDay > 31)
	{
		if (m_nMonth == 12)
		{
			m_nYear++;
			m_nMonth = 1;
			m_nYear = 1;
		}
		else
		{
			m_nMonth++;
			m_nDay = 1;
		}
	}
	else if (m_nDay == 31)
	{
		if (m_nMonth == 4 || m_nMonth == 6 || m_nMonth == 9 || m_nMonth == 11)
		{
			m_nMonth++;
			m_nDay = 1;
		}
	}
}
void CDate::Setdate(int year,int month,int day)
{
	m_nDay = day;
	m_nMonth = month;
	m_nYear = year;
}
CDate::~CDate()
{
}
bool CDate::Isleapyear()
{
	bool bLeap;
	if (m_nYear % 4 != 0) bLeap = false;
	else if (m_nYear % 100 != 0) bLeap = true;
	else if (m_nYear % 400) bLeap = false;
	return bLeap;
}
void main()
{
	CDate date;
	int y, m, d;
	cout << "年月日" << endl;
	cin >> y >> m >> d;
	date.Setdate(y, m, d);
	cout << "当前日期:";
	date.Display();
	date.Adddate();
	cout << "当前日期加1:";
	date.Display();
	system("pause");
}