public static string ToFraction(long integer, long numerator, long denominator, FractionalizeOptions options = null)
{
if (options == null)
{
options = new FractionalizeOptions();
}
return(FormatResult(Math.Abs(integer), numerator, denominator, options, integer < 0));
}
public static string ToFraction(double number, FractionalizeOptions options = null)
{
if (options == null)
{
options = new FractionalizeOptions();
}
lock (DenominatorMap)
{
if (DenominatorMap.Count < options.MaxDenominator)
{
CreateDenominatorMap(options.MaxDenominator);
}
}
if (number > long.MinValue && number < long.MaxValue)
{
var isNegative = number < 0;
var decimalPortion = Math.Abs(number) - Math.Truncate(Math.Abs(number));
var integerPortion = Convert.ToInt64(Math.Floor(Math.Abs(number)));
for (var i = 0; i < options.MaxDenominator; ++i)
{
lock (DenominatorMap)
{
for (var j = 0; j < DenominatorMap[i].Count; ++j)
{
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (decimalPortion == DenominatorMap[i][j])
{
return(FormatResult(integerPortion, j + 1, i + 1, options, isNegative));
}
}
}
}
if (!options.ExactMatch)
{
for (var i = 0; i < options.MaxDenominator; ++i)
{
lock (DenominatorMap)
{
for (var j = 0; j < DenominatorMap[i].Count; ++j)
{
if (decimalPortion + options.Tolerance > DenominatorMap[i][j] &&
decimalPortion - options.Tolerance < DenominatorMap[i][j])
{
return(FormatResult(integerPortion, j + 1, i + 1, options, isNegative, true));
}
}
}
}
}
}
return(number.ToString(options.Culture));
}
public static string ToFraction(float number, FractionalizeOptions options = null)
{
return(ToFraction(Convert.ToDouble(number), options));
}
public static string ToFraction(string number, FractionalizeOptions options = null)
{
return(ToFraction(Convert.ToDouble(number, options?.Culture), options));
}
private static string FormatResult(long integerPortion, long numerator, long denominator, FractionalizeOptions options, bool isNegative, bool isApproximate = false)
{
if (UnicodeMap.ContainsKey(denominator) && UnicodeMap[denominator].ContainsKey(numerator))
{
return(String.Join("", isApproximate && options.ShowApproximationSymbol ? "\u2248" : "", isNegative ? "-":"", integerPortion != 0 ? integerPortion.ToString() : "", integerPortion != 0 && options.SpaceBetweenIntegerAndFraction ? " " : "", UnicodeMap[denominator][numerator].ToString()));
}
return(String.Join("", isApproximate && options.ShowApproximationSymbol ? "\u2248" : "", isNegative ? "-":"", integerPortion != 0 ? integerPortion.ToString() : "", integerPortion != 0 && options.SpaceBetweenIntegerAndFraction ? " " : "", numerator.ToString(), "/", denominator.ToString()));
}
public static string ToFraction(this double number, FractionalizeOptions options = null)
{
return(Fractionalize.ToFraction(number, options));
}
public static string ToFraction(this decimal number, FractionalizeOptions options = null)
{
return(Fractionalize.ToFraction(Convert.ToDouble(number), options));
}