Friend ostream& operator<<(ostream& stream, CArr& obj);

#pragma once
class CArr{
    int* arr = nullptr;
    int size = 10;
    void swap(int *a, int *b);
    void swap(int &a, int &b);
    friend ostream& operator<<(ostream& stream, CArr& obj);
    friend istream& operator>>(istream& stream, CArr& obj);
public:
    CArr();
    CArr(const int size);
    CArr(const CArr& obj);
    CArr& operator=(const CArr& obj);
    CArr operator+(const CArr& obj);
    CArr operator-(const CArr& obj);
    int& operator[](const int& index);
    bool operator>(const CArr& obj);
    bool operator<(const CArr& obj);
    bool operator==(const CArr& obj);
    bool operator!=(const CArr& obj);
    bool operator>=(const CArr& obj);
    bool operator<=(const CArr& obj);
    void sort(const int flag);
    ~CArr();
};

ostream& operator<<(ostream& stream, CArr& obj) {
    for (int i = 0; i < obj.size; i++) {
        stream << obj.arr[i] << ' ';
    }
    cout << endl;
    return stream;
}
istream& operator>>(istream& stream, CArr& obj) {
    for (int i = 0; i < obj.size; i++) {
        stream >> obj.arr[i];
    }
cout << endl;
    return stream;
}

Error   7   error C2433: 'istream' : 'friend' not permitted on data declarations
Error   2   error C2433: 'ostream' : 'friend' not permitted on data declarations
Error   5   error C2805: binary 'operator <<' has too few parameters