#include "stdafx.h"
#include "iomanip"
#include <iostream>
using namespace std;
void main()
{ 
 setlocale(LC_ALL, "russian");
double x1, y1, x2, y2, x3, y3, x4, y4, a;
//// 
x1=4;
y1=6;
x2=6;
y2=6;
/////
cout << "Mесто распления точки" << endl;
//cin >> u;'/n';
//cout << "да"<<e << endl;
a=(x2-x1)/2;
x3=x2-a;
y3=y1+a;
x4=x2-a;
y4=y1-a;
cout << x3,y3,x4,y4;
cout << endl;
getchar () ;
}