центр вписанной окружности

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

using namespace std;

struct otrezok
{
  double x1, y1, x2, y2;
  double length;

  void dlina (double x, double y, double x2_1, double y2_1)
 {
   x1 = x;
   y1 = y;
   x2 = x2_1;
   y2 = y2_1;
   length = sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1));
 }
};

struct vershina
{
  double x, y;
};

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

otrezok sozdanie(vershina one, vershina two)
{
  otrezok a;
  a.dlina(one.x, one.y, two.x, two.y);
  return a;
}

direct result(vershina one, vershina two)
{
  direct stright;
  if(two.x - one.x != 0)
  {
    stright.a = (one.y - two.y)/(one.x - two.x);
    stright.b = one.y - stright.a*one.x;
  }
  else stright.parametr = one.x;
  return stright;
}

vershina point (vershina one, vershina two, otrezok left, otrezok right, otrezok a)
{
  vershina point_bissek;
  double m = left.length*a.length/(right.length+left.length);
  double n = a.length - m;
  point_bissek.x = (n*one.x+m*two.x)/(n+m);
  point_bissek.y = (n*one.y+m*two.y)/(n+m);
  //cout << point_bissek.x << " " << point_bissek.y << endl;
  return point_bissek;
}

vershina otvet (direct bissek_1, direct bissek_2)
{
 vershina otvet;

 if (bissek_1.parametr == 0 && bissek_2.parametr == 0)
   {
     otvet.x = (bissek_2.b - bissek_1.b)/(bissek_1.a - bissek_2.a);
     otvet.y = bissek_1.a*otvet.x + bissek_1.b;
   }
   else if (bissek_1.parametr != 0)
   {
     otvet.x = bissek_1.parametr;
     otvet.y = bissek_2.a*otvet.x + bissek_2.b;
   }
   else
   {
     otvet.x = bissek_2.parametr;
     otvet.y = bissek_1.a*otvet.x + bissek_1.b;
   }

 return otvet;
};

int main ()
{
  vershina A, B, C;
  cin >> A.x >> A.y >> B.x >> B.y >> C.x >> C.y;

  otrezok *arr = new otrezok[3];

    arr[0] = sozdanie(A, B);
    arr[1] = sozdanie(B, C);
    arr[2] = sozdanie(A, C);

  vershina peresech_AB = point(A, B, arr[2], arr[1], arr[0]);
  vershina peresech_BC = point(B, C, arr[0], arr[2], arr[1]);

  direct bissek_A = result(A, peresech_BC);
  direct bissek_C = result(C, peresech_AB);

  cout.precision(6);
  cout << fixed << otvet(bissek_A, bissek_C).x << " ";
  cout << fixed << otvet(bissek_A, bissek_C).y;
}