Вещественное к рациональному

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
struct drob
{
  unsigned int chislitel;
  unsigned int znamenatel;
};
short N_array( double real_number, short int accuracy, double *arrayni)
{
  double Ri;
  double Ni;
  short int index;
  double i;
  Ri = real_number;
  index = 0;
  while(index<accuracy*4)
    {
     Ni = 1/Ri;
     if (Ni > INT_MAX) {index--; break;}
     i = floor(Ni);
     arrayni[index] = i;
     Ri = Ni-i;
     if (Ri == 0.0)
       break;
    index++;
    }
  return index;
}
struct drob Ns_Ds( double real_number, short int accuracy)
{
  struct drob Drib;
  unsigned  int Ns;
  unsigned  int Ds;
  unsigned  int N;
  unsigned  int D;
  short int index;
  short int position;
  double array_ni [accuracy*4];
  position = N_array(real_number,accuracy,array_ni);
  Ns = 1;
  Ds = array_ni[position];
  index = position-1;
  while (index != -1)
    {
      N = Ds;
      D = Ds*array_ni[index] + Ns;
      Ns = N;
      Ds = D;
      index--;
    }
  Drib.chislitel = Ns;
  Drib.znamenatel = Ds;
  return Drib;
}
 
int main(void)
{
  struct drob drib1;
  double real1;
  double i;
  printf("Старт\n");
  i = 0.820; /*Вот оно стартовое значение цикла */
  while (i<0.823)
  {
      drib1 = Ns_Ds(i,3);
      printf("%f",i);
      printf(" = %u", drib1.chislitel);
      printf(" %u \n",drib1.znamenatel);
      i = i+0.001;
      drib1.chislitel = 0;
      drib1.znamenatel = 0;
  }
  return 0;
}