public BigRational(double value)
{
var whole = Math.Truncate(value);
var wholeRat = new UnsafeBigRational((BigInteger)whole, 1);
var frac = value - whole;
var scale = Math.Pow(10, frac.ToString().Length - 1); // a power of 10 that moves the fractional part into a whole number
var b = new UnsafeBigRational((long)(frac * scale), // multiply frac by scale to get the fractional part as a whole number
(long)scale) // then divide the scale back out to turn it back into a fraction... but this time, we're in a rational, so we don't lose info
+ wholeRat; // Finally, add the whole portion back
var gcd = BigInteger.GreatestCommonDivisor(b.Numerator, b.Denominator); // then reduce the resultant fraction
this.Numerator = b.Numerator / gcd;
this.Denominator = b.Denominator / gcd;
}
public static BigRational Sum(this IEnumerable <BigRational> rat)
{
UnsafeBigRational temp = new UnsafeBigRational();
void Add(BigRational other)
{
temp.Numerator = (temp.Numerator * other.Denominator) + (other.Numerator * temp.Denominator);
temp.Denominator *= other.Denominator;
}
foreach (var v in rat)
{
Add(v);
}
return(temp.Normalize());
}
