Question

Create a class Date whose object can store a day, month and year. Include the necessary
constructors to initialize the objects and function to display the date in ‘dd/mm/yyyy’ format.
Define a non-member function findAge(Date dob, Date today) which should return the calculated
age from the input dates ‘dob’ and ‘today’. Set this function as friend to Date class. Write a main
function to read the today’s date and date of birth of a person from the user and display the age
of that person by calling the proper function.

Answer 1

#include <iostream>
#include <string>


using namespace std;


class Date{
private:
	//object can store a day, month and year.
	int day;
	int month;
	int year;
public:
	//constructors to initialize the objects 
	Date(int day,int month,int year){
		this->day=day;
		this->month=month;
		this->year=year;
	}
	//function to display the date in ‘dd/mm/yyyy’ format.
	void display(){
		cout<<this->day<<"/"<<this->month<<"/"<<this->year;
	}
	int getDay(){
		return day;
	}
	int getMonth(){
		return month;
	}
	int getYear(){
		return year;
	}


	//Set this function as friend to Date class.
	friend Date findAge(Date dob, Date today);
};


//Define a non-member function findAge(Date dob, Date today) which should return the calculated
//age from the input dates ‘dob’ and ‘today’.
Date findAge(Date dob, Date today){
	//aray of days in months
	int month[] = { 31, 28, 31, 30, 31, 30, 31,
		31, 30, 31, 30, 31 };


	if (dob.day > today.day) {
		today.day+=  month[dob.month - 1];
		today.month--;
	}
	if (dob.month > today.month) {
		today.year--;
		today.month += 12;
	}
	//calculate age
	int ageDays = today.day - dob.day;
	int ageMonths = today.month - dob.month;
	int ageYears =today.year - dob.year;
	return Date(ageDays,ageMonths,ageYears);
}








//Write a main function to read the today’s date and date of birth of a 
//person from the user and display the age of that person by calling the proper function.
int main () {




	int dayNow;
	int monthNow;
	int yearNow;
	int personBirthDay;
	int personBirthMonth;
	int personBirthYear;


	//get today's date
	cout<<"Enter today's date: ";
	cin>>dayNow>>monthNow>>yearNow;
	Date todayDate(dayNow,monthNow,yearNow);
	//get the person birthdate
	cout<<"Enter the person birthdate: ";
	cin>>personBirthDay>>personBirthMonth>>personBirthYear;
	Date personBirthDate(personBirthDay,personBirthMonth,personBirthYear);


	cout<<"\nToday's date: ";
	todayDate.display();
	cout<<"\nThe person birthdate: ";
	personBirthDate.display();
	Date ageDate=findAge(personBirthDate,todayDate);
	//display age
	cout<<"\nThe age of the person is: "<<ageDate.getYear()<<" year(s), "<<ageDate.getMonth()<<" month(s),"<<ageDate.getDay()<<" day(s).\n\n";


	//Delay
	system("pause");
	return 0;
}