Ошибки в коде

#include "stdafx.h"
#include "Line.h"
#include<iostream>
 
int _tmain(int argc, _TCHAR* argv[])
{
    Line q;
    cout << q << endl;
    system("pause");
    return 0;
}

#pragma once
#include<iostream>
#include "stdafx.h"
using namespace std;
 
class Line
{
    struct Point
    {
        double x, y;
    };
 
public:
    double Length();
    double Angle();
    Line(void);
    ~Line(void);
private:
    Point A;
    friend istream & operator>>(istream & input, Line& q);
    friend ostream & operator<<(ostream & output, Line& q);
};

#include "Line.h"
#include "stdafx.h"
#include <cmath>
#include<iostream>
using namespace std;
#define sqr(x) ((x) * (x))
 
Line::Line(void)
{
    cout << "Type coordinates in format x y\t";
    cin >> (*this);
}
 
 
Line::~Line(void)
{
}
 
 
double Line::Length()
{
    return sqrt(sqr(A.x) + sqr(A.y));
}
 
 
double Line::Angle()
{
    return atan(A.x / A.y);
}
 
 
ostream & operator<<(ostream & output, Line& q)
{
    output << "Length == " << q.Length() << "\tAngle == " << q.Angle() << " rad";
    return output;
}
 
 
istream & operator>>(istream & input, Line& q)
{
    input >> q.A.x >> q.A.y;
    return input;
}