Error C2664 в cin.getline()

#include <iostream>
#include <conio.h>
#include <string.h>
using namespace std;
 
struct adress
{
    char city{ 20 };
    int index;
    char street{ 100 };
    int building;
    int apr;
};
struct abonent
{
    char name{ 20 };
    char surname{ 50 };
    int year_of_birth;
    char sex{ 10 };
    int phone;
    adress location;
};
 
void print_menu()
{
    cout <<
        "===============================================\n"
        "1 - Add new abonent\n"
        "2 - Delete information about some abonent by index\n"
        "3 - Delete information about all abonents\n"
        "4 - Change information about abonent by index\n"
        "5 - See information about abonent by index\n"
        "6 - See information about all abonents\n"
        "7 - Save current list if file\n"
        "8 - Load current list if file\n"
        "9 - Find information by parameters\n"
        "0 - Exit\n"
        "===============================================\n";
}
 
int menu_choice()
{
    cout << "Your choose: " << flush;
 
    char key;
    do
    {
        key = _getch();
    } while (key < '0' || key > '9');
 
    cout << key << endl << endl;
 
    return key - '0';
}
 
void main()
{
    abonent *ab = nullptr;
    int count = 0;
 
    int choice;
    int num;
    int tmp_count;
    char tmp_name[50];
 
    do
    {
        print_menu();
        choice = menu_choice();
 
        switch (choice)
        {
        case 0:
            if (count > 0)
                delete[] ab;
            return;
 
        case 1:
            cout << "================\n";
            cout << "Enter information about new abonent\n";
            cout << "================\n";
 
            if (count == 0)
            {
                ab = new abonent[1];
                if (ab == nullptr)
                {
                    cout << "Error with memory!\n";
                    return;
                }
            }
            else
            {
                abonent *tmp = new abonent[count + 1];
                for (int i = 0; i < count; i++)
                    tmp[i] = ab[i];
                delete[] ab;
                ab = tmp;
            }
 
            cout << "Name: ";
            cin.ignore();
            cin.getline(ab[count].name, 20);
            cout << "Surname: ";
            cin.getline(ab[count].surname, 50);
            cout << "Year of birth: ";
            cin >> ab[count].year_of_birth;
            cout << "Sex : ";
            cin.getline (ab[count].sex, 10);
            cout << "Phone number: ";
            cin >> ab[count].phone;
            cout << "City: ";
            cin.getline(ab[count].location.city, 20);
            cout << "Index: ";
            cin >> ab[count].location.city;
            cout << "Street: ";
            cin.getline(ab[count].location.street, 100);
            cout << "Building: ";
            cin >> ab[count].location.building;
            cout << "Apartment: ";
            cin >> ab[count].location.apr;
 
            count++;
 
            cout << endl;
            break;
 
        case 2:
 
            cout << "==============================\n";
            cout << "Delete information about some abonent by index";
            cout << "==============================\n";
            cout << "Enter student's index in list: ";
            cin.ignore();
            cin >> num;
 
            if (num > 0 && num <= count)
            {
                num--;
 
                if (count == 1)
                {
                    delete[] ab;
                    ab = nullptr;
                }
                else
                {
                    abonent *tmp = new abonent[count - 1];
                    for (int i = 0; i < num; i++)
                        tmp[i] = ab[i];
 
                    for (int i = num + 1; i < count; i++)
                        tmp[i - 1] = ab[i];
 
                    delete[] ab;
                    ab = tmp;
                }
                count--;
 
                cout << "Information deleted.\n\n";
            }
 
            break;
        case 3:
        case 4:
            cout << "===============================\n";
            cout << " Change information about abonent by index \n";
            cout << "===============================\n";
            cout << "Enter student's index in list: ";
            cin >> num;
 
            if (num > 0 && num <= count)
            {
                cout << "Name: " << ab[count].name << endl;
                cout << "Surname: " << ab[count].surname << endl;
                cout << "Year of birth: " << ab[count].year_of_birth << endl;
                cout << "Sex : " << ab[count].sex << endl;
                cout << "Phone number: " << ab[count].phone << endl;
                cout << "City: " << ab[count].location.city << endl;
                cout << "Index: " << ab[count].location.city << endl;
                cout << "Street: " << ab[count].location.street << endl;
                cout << "Building: " << ab[count].location.building << endl;
                cout << "Apartment: " << ab[count].location.apr;
 
                cout << endl;
            }
 
            break;
        case 5:
            cout << "===============================\n";
            cout << " See information about abonent by index \n";
            cout << "===============================\n";
            cout << "Enter student's index in list: ";
            cin >> num;
 
            break;
        case 6:
            break;
        case 7:
            break;
        case 8:
            break;
        case 9:
            break;
        } 
    }while (true);
 
}

char city[20];