Перевести из C++ в C#

#include <iostream>
#include <sstream>
#include <cmath>
#include <cstdlib>
 
#define ROOTSIGN ((char)0xAC + std::string("/"))
 
struct radical
{
  int radicand;
 
  radical(int _radicand = 0);
  std::string toString();
 
  int getPerfectSquare();
  bool isInteger();
};
 
class fraction
{
  private:
    int num;
    radical numRadical;
    int denum;
 
    bool isRadical;
 
    void reduce();
 
  public:
    fraction (int _num, int _denum);
    fraction (radical _num, int _denum);
    std::string toString();
};
 
int main()
{
  setlocale(LC_ALL, "russian");
  int a, b, c;
  std::cin >> a >> b >> c;
 
  if (a == 0)
  {
    if (b != 0)
      std::cout << "a = 0; уравнение вырождается в линейное:\n"
                << "x = " << fraction(-c,b).toString() << std::endl;
    else if (c == 0)
      std::cout << "Все коэффициенты равны нулю; x - любое число." << std::endl;
    else
      std::cout << "Нет решений." << std::endl;
  }
  else
  {
    long long discriminant = b*b - 4*a*c;
 
    if (discriminant != 0)
    {
      std::cout << "D != 0; 2 корня:\n";
 
      radical dRoot (discriminant);
 
      if (dRoot.isInteger())
      {
        std::cout << "x1 = " << fraction(-b + sqrt(discriminant), 2*a).toString() << "\n"
                  << "x2 = " << fraction(-b - sqrt(discriminant), 2*a).toString() << std::endl;
      }
      else
      {
        std::string rational = fraction(-b, 2*a).toString(),
                    irrational = fraction(radical(discriminant), 2*a).toString();
        if (rational == "0")
          std::cout << "x1 = " << irrational << "\n"
                    << "x2 = " << "- " << irrational << std::endl;
        else
          std::cout << "x1 = " << rational << " + " << irrational << "\n"
                    << "x2 = " << rational << " - " << irrational << std::endl;
      }
    }
    else if (discriminant == 0)
      std::cout << "D = 0; 1 корень:\n"
                << "x = " << fraction(-b, 2*a).toString() << std::endl;
  }
 
  return 0;
}
 
 
fraction::fraction (int _num, int _denum = 1)
{
  num = _num;
  denum = _denum;
 
  isRadical = false;
 
  reduce();
}
 
fraction::fraction (radical _num, int _denum = 1): numRadical(_num)
{
  denum = _denum;
 
  isRadical = true;
 
  reduce();
}
 
std::string fraction::toString()
{
  std::stringstream ss;
  if (denum == 0)
    ss << "NaN. Shouldn't be here.";
  else
  {
    if (!isRadical)
      ss << num;
    else
      ss << numRadical.toString();
 
    if (denum > 1)
      ss << '/' << denum;
  }
  return ss.str();
}
 
void fraction::reduce()
{
  int a, b;
  if (!isRadical)
  {
    a = abs(num);
    b = abs(denum);
  }
  else
  {
    a = abs(numRadical.getPerfectSquare());
    b = abs(denum);
  }
 
  if (a < b)
  {
    a ^= b;
    b ^= a;
    a ^= b;
  }
  while (a*b != 0)
  {
    int tmp = b;
    b = a%b;
    a = tmp;
  }
 
  int gcd = a + b;
 
  if (denum < 0)
    gcd *= -1;
 
  if (!isRadical)
    num /= gcd;
  else
    numRadical.radicand /= gcd*gcd;
 
  denum /= gcd;
}
 
radical::radical(int _radicand)
{
  radicand = _radicand;
}
 
std::string radical::toString()
{
  std::stringstream ss;
  if (radicand < 0)
  {
    ss << "i*";
    radicand *= -1;
  }
 
  if (radicand == 0)
    ss << 0;
  else
  {
    int perfectSquare = getPerfectSquare();
    if (perfectSquare != 1)
      ss << perfectSquare;
 
    perfectSquare *= perfectSquare;
    if (radicand != perfectSquare)
      ss << ROOTSIGN << radicand/perfectSquare;
  }
  return ss.str();
}
 
int radical::getPerfectSquare()
{
  int a = abs(radicand), square = 1;
  int maxDiv = floor(sqrt(a));
 
  for (int i = 2; i <= maxDiv; i++)
  {
    while (a % (i*i) == 0)
    {
      a /= i*i;
      square *= i;
    }
    maxDiv = floor(sqrt(a));
  }
 
  return square;
}
 
bool radical::isInteger()
{
  int s = getPerfectSquare();
  return (radicand == s*s);
}