Write a program overloading unary operator to increment date using oops in c++

Sure, here is a simple example of a C++ program that overloads the unary operator ++ to increment the date:

#include<iostream>
using namespace std;

class Date {
    int day, month, year;
public:
    Date(int d=1, int m=1, int y=2000): day(d), month(m), year(y) {}

    void displayDate() {
        cout << "Date: " << day << "/" << month << "/" << year << endl;
    }

    // Overload unary ++ operator
    Date operator++() {
        day = day + 1;
        if(day > 30) {
            month++;
            day = 1;
        }
        if(month > 12) {
            year++;
            month = 1;
        }
        return Date(day, month, year);
    }
};

int main() {
    Date date1(31, 12, 2021);
    date1.displayDate();
    ++date1;
    date1.displayDate();
    return 0;
}

In this program, we have a Date class with a constructor to initialize the date, a displayDate function to print the date, and an overloaded operator++ function to increment the date.

In the operator++ function, we increment the day by 1. If the day exceeds 30, we increment the month by 1 and reset the day to 1. If the month exceeds 12, we increment the year by 1 and reset the month to 1.

In the main function, we create a Date object date1 with the date 31/12/2021, display the date, increment the date using the overloaded ++ operator, and display the date again. The output will be:

Date: 31/12/2021
Date: 1/1/2022

Please note that this is a simple example and does not take into account leap years or the different number of days in different months.