日期之差

#include <iostream>
#include <cstdio>
using namespace  std;
int days[][2]={
	0,0,
	31,31,
	28,29,
	31,31,
	30,30,
	31,31,
	30,30,
	31,31,
	31,31,
	30,30,
	31,31,
	30,30,
	31,31

};
int isRun(int year){
	if(year%4 ==0 && year%100!=0 || year%400 ==0)
		return 1;
	else
		return 0;
}



struct Date{
	int year;
	int month;
	int day;
	Date(int year,int month,int day)
	{
		this->year=year;
		this->month=month;
		this->day=day;
	}
	void nextDay()
	{
		day++;
		if(day>days[month][isRun(year)])
		{
			day=1;
			month++;
			if(month>12)
			{
				month=1;
				year++;
			}
		}
	}
	bool equalDate(const Date &b){
		return (year==b.year && month==b.month && day==b.day) ;
	}
	bool operator==(const Date &b)const{
		return (year==b.year && month==b.month && day==b.day) ;
	}
	bool operator<(const Date &b) const{
		if(year!=b.year)
			return year<b.year;
		if(month!=b.month)
			return month<b.month;
		return day<b.day;
	}
};
void swap(Date &a,Date &b)
{
	Date tmp=a;
	a=b;
	b=tmp;
}
int main()
{
	int y1,m1,d1;
	int y2,m2,d2;
	
	cout<<"请输入日期:"<<endl;
	while (scanf("%4d%2d%2d",&y1,&m1,&d1)==3 && scanf("%4d%2d%2d",&y2,&m2,&d2)==3 )
	{
		Date a(y1,m1,d1);
		Date b(y2,m2,d2);
		if(b<a) swap(a,b);
		int count=0;
		while (!(a==b))
		{
			count++;
			a.nextDay();
		}
		printf("%04d年%02d月%02d日与%04d年%02d月%02d日相差%d天\n",y1,m1,d1,y2,m2,d2,count);
		cout<<"请输入日期:"<<endl;
	}
	return 0;
}