date.cpp

This a Date class overloading operator ++,--,+=,-=,+,-,>>,<<

// Date.cpp: implementation of the Date class.
//
//////////////////////////////////////////////////////////////////////
#include <iostream.h>
#include "Date.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
int songay(int m, int y){
	int sn[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
	if (((y%4==0)&&(y%100!=0))||(y%400==0))
		sn[2] = 29;
	return sn[m];
}
Date::Date()
{

}

Date::~Date()
{

}

Date Date::operator ++()
{
	if (d<songay(m,y)) d++;
	else {
		if (m<12)m++;
		else {y++;m=1;}
		d = 1;
	}
	return (*this);
}

Date Date::operator ++(int)
{
	Date t = *this;
	++(*this);
	return t;
}
istream &operator >> (istream &in, Date &x){
	cout<<"Nhap ngay:"; in>>x.d;
	cout<<"Nhap thang:"; in>>x.m;
	cout<<"Nhap nam:"; in>>x.y;
	return in;
}
ostream &operator << (ostream &out,const Date &x){
	out<<x.d<<"/"<<x.m<<"/"<<x.y<<endl;
	return out;
}