/// <summary>
/// Format integer number with unit of measure to the correct string on russian language.
/// </summary>
/// <example>
/// For arguments (123, UnitOfMeasure.Ruble) method should return "сто двадцать три рубля".
/// </example>
public string Convert(long number, UnitOfMeasure unit)
{
// Check for the min value that can't be represented as long positive value
if (number == long.MinValue)
{
throw new ArgumentOutOfRangeException(nameof(number));
}
_result = new StringBuilder();
// Check for negative number
if (number < 0)
{
//_result.Append(' ');
_result.Append(Constants.Minus);
number = -number;
}
else if (number == 0)
{
_result.Append(Constants.Zero);
}
// Numbers more than 999 billions is not supported
if (number >= E12)
{
throw new ArgumentOutOfRangeException(nameof(number));
}
// Write billions
if (number >= E9)
{
var value = number / E9;
Append((int)value, Constants.Е9Unit);
number = number % E9;
}
// Write millions
if (number >= E6)
{
var value = number / E6;
Append((int)value, Constants.Е6Unit);
number = number % E6;
}
// Write thouthands
if (number >= E3)
{
var value = number / E3;
Append((int)value, Constants.Е3Unit);
number = number % E3;
}
// Write hundreds
if (number > 0)
{
Append((int)number, unit);
}
else
{
AppendUnitOfMeasure(5, unit);
}
// Finilize result
return(_result.ToString().Trim());
}
/// <summary>
/// Convert number to words on russian language (with unit of measure).
/// </summary>
/// <example>
/// <code>
/// var numInWords = RussianConverter.Format(123, UnitOfMeasure.Ruble);
/// Console.WriteLine(numInWords); // Print "сто двадцать три рубля"
/// </code>
/// </example>
/// <param name="number">Number to format.</param>
/// <param name="unit">Unit of measure.</param>
/// <returns>Number in words on russian language with unit of measure.</returns>
public static string Format(long number, UnitOfMeasure unit)
{
return(new Algorithm()
.Convert(number, unit));
}