How to access private member - array with friend function

Question

I am new to C++ and I write code to see how friend functions work. Here are two classes and I ask the user in friend function for parameters, which if they are equal with the values of the member variables, to be displayed. And I can't access one of the private members - the array with the country names. In the function int elcountry(element &e, supply s) I am trying to display the number of elements which are of a certain type and from a particular country. The error is that member supply::country, (s.country[i]) in elCountry function is inaccessible. I don't know how to use getCountry() function to access the private array.

class element {
        friend class supply;
    private:
        string name;
        double value;
        int serial;
    public:
        element();
        int elCountry(element &e, supply &s);
         double* nominals(element &e, supply &s);
        string getName() {
            return name;
        }
        int getSerial() {
            return serial;
        }
    };
    class supply {
    private:
        int serial;
        string country[5];
        int n;
    public:
        supply();
        string* getCountry() {
            string country = new string[5];
                return country;
        }
        friend int elCountry(element &e, supply &s);
        friend double* nominals(element &e, supply &s);
    };
    int elcountry(element &e, supply s){
        string names, Country;
        int n;
        cout << "enter country = "; cin >> Country;
        cout << "enter name of the element = "; cin >> names;
        cout << "enter number of elements = "; cin >> n;
        for (int i = 0; i < 5; i++) {
            if (Country == s.country[i] && names  == e.getName() && n ==  e.getSerial()) {
                cout << "the country is " << count << endl;
                cout << "the name is" << names << endl;
                cout << "the number is " << n << endl;
            }
        }
           return n;
}

Answer 1

The signature of two functions don't match, they're irrelevant, it's not friend function at all.

friend int elCountry(element &e, supply &s);
             ~                          ~
int elcountry(element &e, supply s){
      ~

Note that the names don't match either.