Operator Overloading in C++: Giving Operators Custom Behavior

#include <iostream>

class Vector2D {
public:
    double x, y;

    Vector2D(double xVal = 0.0, double yVal = 0.0) : x(xVal), y(yVal) {}

    // Overload Binary + (as member function)
    Vector2D operator+(const Vector2D& other) const {
        return Vector2D(x + other.x, y + other.y);
    }

    // Overload Equality ==
    bool operator==(const Vector2D& other) const {
        return (x == other.x) && (y == other.y);
    }

    // Overload Stream << (as non-member friend function)
    friend std::ostream& operator<<(std::ostream& os, const Vector2D& v) {
        os << "Vector2D(" << v.x << ", " << v.y << ")";
        return os;
    }
};

int main() {
    Vector2D v1(3.0, 4.0);
    Vector2D v2(1.5, 2.5);

    Vector2D sum = v1 + v2; // Calls operator+
    std::cout << "v1: " << v1 << "\n";
    std::cout << "v2: " << v2 << "\n";
    std::cout << "Sum: " << sum << "\n";

    std::cout << "Are equal: " << (v1 == v2 ? "YES" : "NO") << "\n";
    return 0;
}