"Создать класс Date для работы с датами в формате «год.месяц.день» - C++ - Ответ 13179229

#include <iostream>
using namespace std;
 
class Date
{
public:
    int after_a_specified_number_of_days();             //Забыл все скобки и компилятор их за переменные принимает
    int subtraction_of_a_specified_number_of_days();
    int leap_year();
    int assignment_of_individual_parts();
    int date_comparison();
    int calculating_the_number_of_days_between_dates();
    void set();         //Этих двух методов вообще не было
    void show();
private:
    int Year;
    int Year2;
    int Day;
    int Day2;
    int Day3;
    int Month;
    int Month2;
    int D;
    int D2;
 
};
 
int Date::after_a_specified_number_of_days()
{
    return(Day + Day2);
}
int Date::subtraction_of_a_specified_number_of_days()
{
    return(Day - Day3);
}
int Date::leap_year()
{
    while (Year / 4 == 0)           //Второе равно забыл
    {
        cout << "Year is a leap year";
    }
    while (Year / 4 != 0)
    {
        cout << "The year is not a leap year";
    }
 
}
int Date::assignment_of_individual_parts()
{
    return(Day + Day2, Month + Month2, Year + Year2);
}
int Date::date_comparison()
{
    int D = Day;
    int D2 = Day2;
    while (D < D2)
    {
        cout << "The first date is more than the second" << endl;
    }
    while (D > D2)
    {
        cout << "First date less than second" << endl;
    }
    while (D = D2)
    {
        cout << "The first date is equal to the second" << endl;
    }
}
int Date::calculating_the_number_of_days_between_dates()
{
    return(Day - Day2, Month - Month2, Year - Year2);
}
void Date::set()
{
    cout << "Enter the start date" << endl;
    cin >> Start date;                      //Что это вообще за переменная?
    cout << "Enter the number of days you want to add" << endl;
    cin >> Day2;
    cout << "Enter the number of days you want to subtract" << endl;
    cin >> Day3;
    cout << "Enter the day, month and year you want to assign" << endl;
    cin >> Day >> Month >> Year;
    cout << "Enter comparing dates" << endl;
    cin >> D >>   D2;                       //endl??????????
 
 
}
void Date::show()
{
 
    cout << "Start date:" << Start_date << endl;        //Что это вообще за переменная?
    cout << "Date after the specified number of days:" << after_a_specified_number_of_days() << endl;
    cout << "Date after subtraction:" << subtraction_of_a_specified_number_of_days() << endl;
    cout << leap_year();
    cout << "Date after assignment:" << assignment_of_individual_parts();
    cout << date_comparison();
    cout << "Days between dates:" << calculating_the_number_of_days_between_dates();
 
}
 
 
int main()
{
    Date n1;
    n1.set();
    n1.show();
 
}