How do I Convert a Decimal to a Fraction in c++?

#include <cmath>#include <limits>#include <algorithm>using namespace std;struct Fraction{   int WholePart;   int Numerator;   int Denominator;};//Precision controls how many digits after the decimal are keptbool DecimalToFraction(double DecimalNum, Fraction &Result){   const int MaxIntDigits = numeric_limits<int>::digits10;   const int WholeDigits = int(log10(DecimalNum));   const int FractionDigits = min(numeric_limits<double>::digits10 - WholeDigits, MaxIntDigits-1);   //If number has too many digits, can't convert   if(WholeDigits > MaxIntDigits)   {	   return false;   }   //Separate into whole part and fraction   double WholePart;   DecimalNum = modf(DecimalNum, &WholePart);   Result.WholePart = int(WholePart);   //Convert the decimal to a fraction   const double Denominator = pow(10.0, FractionDigits);   Result.Numerator = int((DecimalNum * Denominator) + 0.5);   Result.Denominator = int(Denominator);   //Return success   return true;}double FractionToDecimal(Fraction &FractionNum){	const double WholePart = double(FractionNum.WholePart);	const double DecimalPart = double(FractionNum.Numerator) / double(FractionNum.Denominator);	return WholePart + DecimalPart;}

std::pair<long, long> SimplestFraction(double Value, double Error){  double Numerator = 0.0;    //Start with the fraction 0/1; it has the smallest positive denominator  double Denominator = 1.0;  //Keep the numerator and denominator as doubles                             //to avoid repeated conversion of long->double->long  double Delta0;  //These two deltas record the amount of error  double Delta1;  //that the current two fractions have  do  {    //We know that our number falls between Numerator/Denominator and (Numerator + 1)/Denominator    //Let's figure out the deltas, to find out which one is closer to our real value    Delta0 = abs(Value - Numerator / Denominator);    Delta1 = abs(Value - (Numerator + 1.0) / Denominator);    //If Delta0 is further from our real value, then we need to make some adjustments    if (Delta0 > Delta1)    {      //Increase the numerator by one, because we need a slightly larger fraction      //to keep up with the denominator increase      Numerator += 1.0;      //Set Delta0 to Delta1, since we'll use that value in the while loop      //below to see if we've found a sufficient fraction, and Delta1 was      //the smaller delta that we decided to go with      Delta0 = Delta1;    }    //Increase the denominator, because (unless we're good this time), we need to keep getting    //a larger denominator to find a more accurate fraction    Denominator += 1.0;  } while (Delta0 > Error);  //As long as our delta is too large, keep trying further  //We've gotten a sufficiently accurate fraction; return the numbers we found  //(reduce the denominator by one, because our last increase of the denominator was unneeded)  return std::pair<long, long>(long(Numerator), long(Denominator) - 1);}

while((numeric_limits<unsigned int>::max() - Low.Denominator > High.Denominator)	&& (numeric_limits<unsigned int>::max() - Low.Numerator > High.Numerator)){	Middle.Numerator = Low.Numerator + High.Numerator;	Middle.Denominator = Low.Denominator + High.Denominator;	if(double(Middle.Numerator) < FractionPart * double(Middle.Denominator))	{		Low = Middle;	}	else	{		High = Middle;	}	if(fabs((double(Middle.Numerator) / double(Middle.Denominator) - FractionPart)) < (PercentError * FractionPart))	{		break;	}	++Iterations;}