5.24打卡

#include <bits/stdc++.h>
using namespace std;
class Point
{
    public:
        Point(int xx=0,int yy=0)
        {
            x=xx;
            y=yy;
        }
        Point(Point &p);
        int getX()
        {
            return x;
        }
        int getY()
        {
            return y;
        }
    private:
        int x,y;
};
Point::Point(Point &p)
{
    x=p.x;
    y=p.y;
    cout<<"Calling the copy constructor of Point"<<endl;
}
class Line 
{
    public:
        Line(Point xp1,Point xp2);
        Line(Line &l);
        double getLen()
        {
            return len;
        }
    private:
        Point p1,p2;
        double len;
};
Line::Line(Point xp1,Point xp2):p1(xp1),p2(xp2)
{
    cout<<"Calling the copy constructor of Line"<<endl;
    double x=static_cast<double>(p1.getX()-p2.getX());
    double y=static_cast<double>(p1.getY()-p2.getY());
    len=sqrt(x*x+y*y);
}
Line::Line(Line &l):p1(l.p1),p2(l.p2)
{
    cout<<"Calling the copy constructor of Line"<<endl;
    len=l.len;
}
int main()
{
    Point myp1(1,1),myp2(4,5);
    Line line(myp1,myp2);
    Line line2(line);
    cout<<"The length of the line is: ";
    cout<<line.getLen()<<endl;
    cout<<"The length of the line2 is: ";
    cout<<line2.getLen()<<endl;
    return 0;
}