Как сделать возврат в главное меню из подпункта меню, здесь код в (.h) и (.cpp)

#pragma once
 
using namespace std;
class Adress
{
 
public:
    Adress(string index_s = "NONE", string country_s = "NONE", string city_s = "NONE", string street_s = "NONE", string housebuilding_s = "NONE", string corpus_s = "NONE", string flat_s = "NONE");
    void change_index(void);
    void change_country(void);
    void change_city(void);
    void change_street(void);
    void change_housebuilding(void);
    void change_corpus(void);
    void change_flat(void);
    void print_index(void);
    void print_country(void);
    void print_city(void);
    void print_street(void);
    void print_housebuilding(void);
    void print_corpus(void);
    void print_flat(void);
    string get_city();
    string get_street();
 
private:
    string index;
    string country;
    string city;
    string street;
    string housebuilding;
    string corpus;
    string flat;
 
};
 
class Adress_arr
{
private:
    static int const max = 50;
    int curent_number_of_elements = 0;
    Adress main_array[max];
 
public:
 
    void add_new_element(Adress name);
    void edit_information(int number);
    void delete_element(int number);
    void show_information(int number);
    void display_all_elements(void);
    void sort_by_adress(void);
    void List_of_street_city(void);
 
};

#include <iostream>
#include <string>
#include "Header.h"
 
using namespace std;
int menu()
{
    int variant;
    cout << "Choose what you need: \n" << endl;
    cout << "0. Add elements\n"
        << "1. Delete element\n"
        << "2. Display all elements \n"
        << "3. Sort by adress \n"
        << "4. List_of_street_city \n"
        << "5. Edit information  \n" << endl;
    cout << ":";
    cin >> variant;
    return variant;
}
 
int main()
{
    setlocale(LC_ALL, "ru");
    Adress_arr Adr;
    Adress M1("45236", "Russia", "Moscow", "Pyshkina", "94", "7", "45");
    Adress M2("45210", "Russia", "Pitter", "Lermontova", "78", "6", "12");
    Adress M3("74582", "Russia", "Cuban", "Tolstogo", "25", "5", "56");
 
    Adr.add_new_element(M1);
    Adr.add_new_element(M2);
    Adr.add_new_element(M3);
    int variant = menu();
    switch (variant)
    {
    case 0:
    {
        Adr.show_information(0);
        Adr.show_information(1);
        Adr.show_information(2);
    }
    break;
    case 1:
    {
        Adr.delete_element(0);
        Adr.display_all_elements();
    }
    break;
    case 2:
    {
        Adr.display_all_elements();
    }
    break;
    case 3:
    {
        Adr.sort_by_adress();
        Adr.display_all_elements();
    }
    break;
    case 4:
    {
        Adr.List_of_street_city();
    }
    break;
    case 5:
    {
        Adr.edit_information(0);
        Adr.show_information(0);
    }
    break;
    }
 
    system("pause");
}
 
Adress::Adress(string index_s, string country_s, string city_s, string street_s, string housebuilding_s, string corpus_s, string flat_s)
{
    index = index_s;
    country = country_s;
    city = city_s;
    street = street_s;
    housebuilding = housebuilding_s;
    corpus = corpus_s;
    flat = flat_s;
}
void Adress::change_index(void)
{
    cout << "Input new index:\n";
    cin >> index;
}
void Adress::change_country(void)
{
    cout << "Input new country:\n";
    cin >> country;
}
void Adress::change_city(void)
{
    cout << "Input new city:\n";
    cin >> city;
}
void Adress::change_street(void)
{
    cout << "Input new street:\n";
    cin >> street;
}
void Adress::change_housebuilding(void)
{
    cout << "Input new housebuilding:\n";
    cin >> housebuilding;
}
void Adress::change_corpus(void)
{
    cout << "Input new corpus:\n";
    cin >> corpus;
}
void Adress::change_flat(void)
{
    cout << "Input new flat:\n";
    cin >> flat;
}
void Adress::print_index(void)
{
    cout << "index: " << index << endl;
}
void Adress::print_country(void)
{
    cout << "country: " << country << endl;
}
void Adress::print_city(void)
{
    cout << "city: " << city << endl;
}
void Adress::print_street(void)
{
    cout << "street: " << street << endl;
}
void Adress::print_housebuilding(void)
{
    cout << "housebuilding: " << housebuilding << endl;
}
void Adress::print_corpus(void)
{
    cout << "corpus: " << corpus << endl;
}
void Adress::print_flat(void)
{
    cout << "flat: " << flat << endl;
}
string Adress::get_city()
{
    return city;
}
string Adress::get_street()
{
    return street;
}
void Adress_arr::add_new_element(Adress name) 
{
    main_array[curent_number_of_elements] = name;
    curent_number_of_elements++;
}
void Adress_arr::edit_information(int count) 
{
    main_array[count].change_index();
    main_array[count].change_country();
    main_array[count].change_city();
    main_array[count].change_street();
    main_array[count].change_housebuilding();
    main_array[count].change_corpus();
    main_array[count].change_flat();
}
void Adress_arr::delete_element(int count)
{
    for (int i = count; i < curent_number_of_elements - 1; ++i)
        main_array[i] = main_array[i + 1];
    curent_number_of_elements--;
}
void Adress_arr::show_information(int number)
{
    main_array[number].print_index();
    main_array[number].print_country();
    main_array[number].print_city();
    main_array[number].print_street();
    main_array[number].print_housebuilding();
    main_array[number].print_corpus();
    main_array[number].print_flat();
}
void Adress_arr::display_all_elements(void) 
{
    for (int i = 0; i < curent_number_of_elements; ++i)
    {
        main_array[i].print_index();
        main_array[i].print_country();
        main_array[i].print_city();
        main_array[i].print_street();
        main_array[i].print_housebuilding();
        main_array[i].print_corpus();
        main_array[i].print_flat();
    }
}
void Adress_arr::sort_by_adress(void)
{
    for (int i = 0; i < curent_number_of_elements; i++)
    {
            for (int j = (curent_number_of_elements - 1); j > i; j--)
            {
                if (main_array[j - 1].get_city() > main_array[j].get_city())
                {
                    Adress temp = main_array[j - 1];
                    main_array[j - 1] = main_array[j];
                    main_array[j] = temp;
                }
            }
    }
}
 
void Adress_arr::List_of_street_city(void) 
{
    string street;
    cout << "Input name street: "; cin >> street;
    cout << "Result of searching:";
    cout << endl;
    for (int i = 0; i < curent_number_of_elements; ++i) {
        if (main_array[i].get_street() == street)
        {
            main_array[i].print_index();
            main_array[i].print_country();
            main_array[i].print_city();
            main_array[i].print_street();
            main_array[i].print_housebuilding();
            main_array[i].print_corpus();
            main_array[i].print_flat();
        }
    }
}

for (;;)
{
system("cls");
   int variant = menu();
    switch (variant)
    {
    case 0:
    {
        Adr.show_information(0);
        Adr.show_information(1);
        Adr.show_information(2);
    }
............................
 
system("pause");
}