/* 5. Write a C++ program to create a class called as DATE. Accept two valid dates in the form of dd/mm/yyyy. Implement the following by overloading the operators - and +. Display the results by overloading the operator << after every operation.
(i). no_of_day = d1 - d2, where d1 and d2 are DATE objects; d1>=d2; and
no_of_days is an integer
(ii) d1 = d1 + no_of_days, where d1 is a DATE object and no_of_days is an integer */

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
class DATE
{
    int days,month,year;
    int a[13];

    public:
        DATE();
        void readdate();
        DATE operator +(int days);
        int operator -(DATE d);
        friend ostream& operator <<(ostream& print,DATE d);
};

DATE::DATE()
{
a[1]=31,a[2]=28,a[3]=31,a[4]=30,a[5]=31,a[6]=30,a[7]=31,a[8]=31,a[9]=30,a[10]=31,a[11]=30,a[12]=31;
}
void DATE::readdate()
{
    cin>>days>>month>>year;
}
DATE DATE::operator +(int n)
{
    for (int i=1; i<=n; i++)
    {
        days++;
        if (days > a[month]) month++,days=1;
        if (month > 12) year++,month=1;
    }
    return (*this);
}
int DATE::operator -(DATE d2)
{
    int count=0;
    if (year < d2.year)
    {
        cout<<"\nError : First date is less than second date.";
        exit(0);
    }
    else if ((year == d2.year) && ((month < d2.month) || (days < d2.days)))
    {
        cout<<"\nError : First date is less than second date.";
        exit(0);
    }
    if ((month == d2.month) && (year==d2.year))
        count = days - d2.days;
    else if (year == d2.year)
    {
        while (month != d2.month)
        {
            count++;
            d2.days++;
            if (d2.days > a[d2.month])
            {
                d2.month++;
                d2.days=1;
            }
        }
        count = count + days - 1;
    }
    else
    {
        while(1)
        {
            if ((year == d2.year) && (month == d2.month)) break;
            count++;
            d2.days++;
            if (d2.days > a[d2.month])
            {
                d2.month++;
                d2.days=1;
            }
            if (d2.month > 12)
            {
                d2.month=1;
                d2.year++;
            }
        }
        count=count+days-1;
    }
    return count;
}
ostream& operator <<(ostream& print,DATE d)
{
    print<<d.days<<"/"<<d.month<<"/"<<d.year;
    return print;
}
void main()
{
    DATE d1,d2;
    clrscr();
    cout<<"\nEnter the first DATE in the form [DD MM YY]:";/*DATE 1 should be less than DATE 2*/
    d1.readdate();
    cout<<"\nEnter the second DATE in the form [DD MM YY]:";
    d2.readdate();
    int no_days=d1-d2;
    cout<<"\nNo of days is:"<<no_days;
    cout<<"\nEnter the no of days to be added to the first DATE :";
    cin>>no_days;
    d1=d1+no_days;
    cout<<"\nAfter addindg days DATE becomes:";
    cout<<d1;
    getch();
}