在c ++中使用函数或类来完成一项简单的任务？

return_type function_name(parameter_list) {
    // function_body
}

int add(int a, int b) {
    return a + b;
}

class ClassName {
public:
    // public_member_functions
    // public_data_members

private:
    // private_member_functions
    // private_data_members
};

class Point {
public:
    int x;
    int y;

    Point(int x, int y) {
        this->x = x;
        this->y = y;
    }

    int distance(Point other) {
        int dx = x - other.x;
        int dy = y - other.y;
        return std::sqrt(dx * dx + dy * dy);
    }
};