последний треугольник

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

using namespace std;

struct otrezok
{
  double x, y;
  double length;
};

struct direct
{
 double k = 0, b = 0;
 double parametr = INT32_MAX;
};

struct vershina
{
  double x, y;
};

direct stright(vershina one, double k)
{
  direct stright;

  if (k != INT32_MAX)
    {
      stright.k = k;
      stright.b = one.y - stright.k*one.x;
    }
  else stright.parametr = one.x;

  return stright;
}

double sozdanie(double a, double b, double c)
{
  double itog;
  double cos_itog = (b*b + c*c - a*a)/2/b/c;
  double sin_itog = sqrt(1 - cos_itog*cos_itog);
  double tg_itog;

  if (cos_itog != 0)
    tg_itog = sin_itog/cos_itog;
  else tg_itog = INT32_MAX;

  return tg_itog;
}

vershina otvet (direct normal_1, direct normal_2)
{
  //cout << normal_1.k << "x + " << normal_1.b << " " << normal_1.parametr << endl;
 vershina otvet;
 if (normal_1.parametr == INT32_MAX && normal_2.parametr == INT32_MAX)
 {
   otvet.x = (normal_2.b - normal_1.b)/(normal_1.k - normal_2.k);
   otvet.y = normal_1.k*otvet.x + normal_1.b;
 }
 else if (normal_1.parametr != INT32_MAX)
 {
   otvet.x = normal_1.parametr;
   otvet.y = normal_2.k*otvet.x + normal_2.b;
 }
 else if (normal_2.parametr != INT32_MAX)
 {
   otvet.x = normal_2.parametr;
   otvet.y = normal_1.k*otvet.x + normal_1.b;
 }
 return otvet;
};

 int main ()
{
  direct BC, AC;
  vershina A, B, C;
  double a, b, c, dlina_AB, dlina_BC, dlina_AC;
  cin >> dlina_AB >> dlina_AC >> dlina_BC;

  A.x = 0;
  A.y = 0;
  B.x = dlina_AB;
  B.y = 0;

  double tg_A = sozdanie( dlina_BC, dlina_AB, dlina_AC);
  double tg_B = sozdanie( dlina_AC, dlina_BC, dlina_AB);

  if (tg_B != INT32_MAX)
   tg_B = -tg_B;

  AC = stright(A, tg_A);
  BC = stright(B, tg_B);

  C = otvet(AC, BC);

cout.precision(10);
 cout << fixed << A.x << " " << A.y << endl;
 cout << fixed << B.x << " " << B.y << endl;
 cout << fixed << C.x << " " << C.y << " ";
}