Get tomorrow date

#include <iostream>

using namespace std;

int main()
{
    int day, month, year;
    cout << "Vuvedi denq: ";
    cin >> day;
    cout << "Vuvedi month: ";
    cin >> month;
    cout << "Vuvedi year: ";
    cin >> year;

    if(month < 1 || month > 12)
    {
        cout << "Vuvedete pravilen mesec";
        return 0;
    }
    if(day < 1 || day > 31)
    {
        cout << "Vuvedi pravilen den";
        return 0;
    }
    else if(day > 29 && month == 2)
    {
        cout << "Vuvedi pravilen den";
        return 0;
    }
    else if(day == 29 && year % 400 != 0)
    {
        cout << "Vuvedi pravilen den";
        return 0;
    }
    if(day == 31 && (month == 4 || month == 6 || month == 9 || month == 11))
    {
        cout << "Vuvedi pravilen den";
        return 0;
    }

    int tomorrowYear = year;
    int tomorrowMonth = month;
    int tomorrowDay = day + 1;


    switch(tomorrowDay)
    {
        case 32:
            switch(tomorrowMonth)
            {
                case 1: case 3: case 5: case 7: case 8: case 10: case 12:
                    tomorrowDay = 1;
                    tomorrowMonth++;
                    if(tomorrowMonth == 13)
                    {
                        tomorrowMonth = 1;
                        tomorrowYear++;
                    }
                    break;
            }
        break;
        case 31:
            switch(tomorrowMonth)
            {
                case 4: case 6: case 9: case 11:
                    tomorrowDay = 1;
                    tomorrowMonth++;
                    break;
            }
        break;
        case 30:
            if(tomorrowMonth == 2)
            {
            tomorrowDay = 1;
                    tomorrowMonth = 3;
            }
            break;
        case 29:
             if (tomorrowMonth == 2)
              {
                if (tomorrowYear % 400 == 0)
                {
                }
                else
                {
                    tomorrowDay = 1;
                    tomorrowMonth = 3;
                }
            }
         break;

    }
    cout << "utre e: " << tomorrowDay << "/" << tomorrowMonth << "/" << tomorrowYear;

}