пересечение медиан

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

struct direct
{
 double a = 0, b = 0;
 double parametr = 0;
};

struct vershina
{
  double x, y;
};

 vershina seredina_storon (vershina one, vershina two)
 {
  vershina seredina;

  seredina.x = (one.x + two.x)/2;
  seredina.y = (one.y + two.y)/2;

  return seredina;
 }

direct mediana (vershina head, vershina seredina)
{
  direct stright;
  if(head.x - seredina.x != 0)
  {
    stright.a = (head.y - seredina.y)/(head.x - seredina.x);
    stright.b = head.y - stright.a*head.x;
  }
  else stright.parametr = head.x;

  return stright;
}

vershina point (direct mediana_1, direct mediana_2)
{
 vershina otvet;

 if (mediana_1.parametr == 0 && mediana_2.parametr == 0)
   {
     otvet.x = (mediana_2.b - mediana_1.b)/(mediana_1.a - mediana_2.a);
     otvet.y = mediana_1.a*otvet.x + mediana_1.b;
   }
   else if (mediana_1.parametr != 0)
   {
     otvet.x = mediana_1.parametr;
     otvet.y = mediana_2.a*otvet.x + mediana_2.b;
   }
   else
   {
     otvet.x = mediana_2.parametr;
     otvet.y = mediana_1.a*otvet.x + mediana_1.b;
   }

 return otvet;
};

int main ()
{
  vershina A, B, C, toshka;

  cin >> A.x >> A.y >> B.x >> B.y >> C.x >> C.y;

  vershina middleAB = seredina_storon(A, B);
  vershina middleBC = seredina_storon(B, C);

  direct medianaA = mediana(A, middleBC);
  direct medianaC = mediana(C, middleAB);

  toshka = point(medianaA, medianaC);

  cout.precision(6);

  cout << fixed << toshka.x << " ";
  cout << fixed << toshka.y;

}