C++中的操作符重载详细解析

using namespace std;

int main()
{
    int a = 2 , b = 3;
    float c = 2.1f , d = 1.2f;
    cout<<"a + b = "<<a+b<<endl;
    cout<<"c + d = "<<c+d<<endl;
    return 0;
}

using namespace std;

class point
{   
    double x;
    double y;
public:
    double get_x()
    {
        return x;
    }
    double get_y()
    {
        return y;
    }
    point(double X = 0.0 , double Y = 0.0):x(X),y(Y){};
    point operator +(point p);
};
//重载操作符“+”
point point::operator +(point p)
{
    double x = this->x + p.x;
    double y = this->y + p.y;
    point tmp_p(x,y);
    return tmp_p;
}
int main()
{
    point p1(1.2,3.1);
    point p2(1.1,3.2);
    point p3 = p1+p2;
    cout<<p3.get_x()<<" "<<p3.get_y()<<endl;
    return 0;
}

using std::endl;
using std::cout;

class point
{   
    double x;
    double y;
public:
    double get_x()
    {
        return x;
    }
    double get_y()
    {
        return y;
    }
    point(double X = 0.0 , double Y = 0.0):x(X),y(Y){};
    friend point operator -(point p1,point p2);
    point operator +(point p);
};
//重载操作符“-”
point operator -(point p1,point p2)
{
    double x = p1.get_x() - p2.get_x();
    double y = p1.get_y() - p2.get_y();
    point p3(x,y);
    return p3;
}
//重载操作符“+”
point point::operator +(point p)
{
    double x = this->x + p.x;
    double y = this->y + p.y;
    point tmp_p(x,y);
    return tmp_p;
}
int main()
{
    point p1(1.2,3.2);
    point p2(1.1,3.1);
    point p3 = p1+p2;
    point p4 = operator-(p1,p2);
    cout<<p3.get_x()<<" "<<p3.get_y()<<endl;
    cout<<p4.get_x()<<" "<<p4.get_y()<<endl;
    return 0;
}