Программирование, перегрузка оператора в с++

 #include <iostream>  
using namespace std;  
 
class point {  
    int x;  
    int y;  
public:  
    point() {  
        x = 0;  
        y = 0;  
    }  
    point(int a, int b) {  
        x = a;  
        y = b;  
    }  
    bool operator == (const point &other) {  
        return (this->x == other.x) && (this->y == other.y);  
    }  
    bool operator != (const point &other) {  
        return !((this->x == other.x) && (this->y == other.y));  
    }  
};  
 
int main() {  
    point a(5, 6);  
    point b(1, 2);  
    cout << (a != b) << endl;   // Добавлены скобки! 
} 

 #include <iostream>

using namespace std;

class Point { 
public: 
    using value_t = int; 
    Point() : x(0), y(0) {} 
    Point(const value_t x, const value_t y) : x(x), y(y) {} 
private: 
    value_t x; 
    value_t y; 
    friend bool operator==(const Point& a, const Point& b) { 
        return a.x == b.x && a.y == b.y; 
    } 
    friend bool operator!=(const Point& a, const Point& b) { 
        return !(a == b); 
    } 
};

int main() { 
    Point a(5, 6); 
    Point b(1, 2); 
    puts(a != b ? "No equal" : "Equal"); 
}