Ошибки при компиляции программы c++

#include <iostream>
#include "Line.h"
using namespace std;
int main(int argc, const char* argv[])
{
 
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    Line l1;
    Line l2;
    cin >> l1 >> l2;
    cout << endl << "F1: " << l1.formula();
    cout << endl << "F2: " << l2.formula();
 
 
    if (!(l1 ^ l2))
        cout << endl << "angle: " << l1 % l2 << endl;
 
    return 0;
}

#include "Line.h"
 
using namespace std;
 
istream& operator>>(istream& in, Line& l)
{
    float x0, x1, y0, y1;
    cout << "Введите x0, y0, x1, y1 " << endl;
    in >>x0>>y0>>x1>>y1;
    l.setPoints({x0,y0}, {x1,y1});
    return in;
}
 
ostream& operator<<(ostream& out, const Line& l)
{
    out << " (" << l.getX0() << l.getY0() << ") " << " (" << l.getX1() << l.getY1() << ") ";
    return out;
}
 
string Line::formula()
{
    int k = (B.y - A.y) / (B.x - A.x);
    int b = (B.x * A.y - A.x * B.y) / (B.x - A.x);
 
    string formula = "y = " + to_string(k) + "x" + " + " + to_string(b);
    return formula;
}
 
bool operator^(const Line& l1, const Line& l2)
{
    int k0 = (l1.getY1 - l1.getY0) / (l1.getX1 - l1.getX0);
    int k1 = (l2.getY1 - l2.getY0) / (l2.getX1 - l2.getX0);
 
    return k0 == k1;
}
 
double operator%(const Line& l1, const Line& l2)
{
    double k0 = (l1.getY1 - l1.getY0) / (l1.getX1 - l1.getX0);
    double k1 = (l2.getY1 - l2.getY0) / (l2.getX1 - l2.getX0);
    double tg = tan((k1 - k0) / (1 + k0 * k1));
    return atan(tg);
}

#ifndef Vector3_h
#define Vector3_h
 
#include <stdio.h>
#include <iostream>
#include <cmath>
#include <cstring>
#include <string>
#include <windows.h>
#include <cmath>
 
using namespace std;
 
 
 
 
class Line
{
private:
    struct Point
    {
        float x;
        float y;
        Point() : x(0), y(0) {};
        Point(float X, float Y) : x(X), y(Y) {};
    };
    Point A, B;
 
public:
    Line() {};
    Line(const Point& p1, const Point& p2) : A(p1), B(p2) {}
    void setPoints(const Point& p1, const Point& p2){
        A=p1;
        B=p2;
    }
 
    float getX0() const { return A.x; }
    float getX1() const { return B.x; }
    float getY0() const { return A.y; }
    float getY1() const { return B.y; }
 
 
    string formula();
 
    friend istream& operator>>(istream& in, Line& l);
    friend ostream& operator<<(ostream& out, const Line& l);
    
    friend double operator%(const Line& l1, const Line& l2);
    friend bool operator^(const Line& l1, const Line& l2);
    
 
};
 
#endif /* Vector3_h*/