/// <summary>
/// Converts a number to the string of approximation.
/// </summary>
/// <param name="number">The number to convert.</param>
/// <param name="accuracy">A nature number for accuracy of the number.</param>
/// <returns>A string format number.</returns>
/// <exception cref="ArgumentOutOfRangeException">accuracy is less than 0 or is greater than 32.</exception>
public string ToApproximationString(ulong number, int accuracy = 1)
{
if (accuracy < 0 || accuracy > 32)
{
throw new ArgumentOutOfRangeException(nameof(accuracy));
}
var levels = number.ToString(CultureInfo.InvariantCulture).Length / GroupLength;
if (levels < 1)
{
return(ConvertString(number.ToString()));
}
var len = levels * GroupLength;
var format = new StringBuilder("0.");
format.Append('0', Math.Min(accuracy, len));
var num = new StringBuilder((number * 1.0 / Math.Pow(10, len)).ToString(format.ToString(), CultureInfo.InvariantCulture));
if ((number / Math.Pow(10, len)).ToString(CultureInfo.InvariantCulture).Length == 4)
{
num.Insert(1, ',');
}
if (levels > 12)
{
num.AppendFormat("×10{0}", NumberSymbols.ToExponentString(levels * GroupLength));
}
else
{
num.Append(digits[12 + levels]);
}
return(ConvertString(num));
}
/// <summary>
/// Converts a number to the string of approximation.
/// </summary>
/// <param name="number">The number to convert.</param>
/// <param name="accuracy">A nature number for accuracy of the number.</param>
/// <returns>A string format number.</returns>
/// <exception cref="ArgumentOutOfRangeException">accuracy is less than 0 or is greater than 32.</exception>
public string ToApproximationString(ulong number, int accuracy = 1)
{
if (accuracy < 0 || accuracy > 32)
{
throw new ArgumentOutOfRangeException(nameof(accuracy));
}
var levels = Math.Abs(number.ToString(CultureInfo.InvariantCulture).Length) / GroupLength;
if (levels < 1)
{
return(number.ToString());
}
var len = levels * GroupLength;
var format = new StringBuilder("0.");
format.Append('0', Math.Min(accuracy, len));
var num = (number * 1.0 / Math.Pow(10, len)).ToString(format.ToString(), CultureInfo.InvariantCulture);
switch (levels)
{
case 1:
return(num + "K");
case 2:
return(num + "M");
case 3:
return(num + "G");
case 4:
return(num + "T");
case 5:
return(num + "P");
case 6:
return(num + "E");
case 7:
return(num + "Z");
case 8:
return(num + "Y");
default:
return(string.Format("{0}×10{1}", num, NumberSymbols.ToExponentString(levels * GroupLength)));
}
}