public void GetWholeNumber_Should_Handle_Default_DecimalPlaces_To_2(decimal value, decimal expectedWholeNumber, decimal expectedDecimalNumber)
{
decimal actualDecimalNumber;
var actualWholeNumber = NumberParser.GetWholeNumber(value, out actualDecimalNumber);
actualWholeNumber.Should().Be(expectedWholeNumber);
actualDecimalNumber.Should().Be(expectedDecimalNumber);
}
public void GetWholeNumber_Should_Separate_Whole_And_Fractional_Component(decimal value, int decimalPlaces, decimal expectedWholeNumber, decimal expectedDecimalNumber)
{
decimal actualDecimalNumber;
var actualWholeNumber = NumberParser.GetWholeNumber(value, out actualDecimalNumber, decimalPlaces);
actualWholeNumber.Should().Be(expectedWholeNumber);
actualDecimalNumber.Should().Be(expectedDecimalNumber);
}
public string Convert(decimal num)
{
var wholeNumber = NumberParser.GetWholeNumber(num, out var remainder);
// parse numbers into usable format
var groups = GetGroups(wholeNumber);
var dollarString = string.Empty;
if (wholeNumber > 0)
{
dollarString = wholeNumber > 1 ? "dollars" : "dollar";
}
var wholeNumberString = GetString(groups);
var centsString = remainder == 1 ? "cent" : "cents";
var andString = wholeNumber > 0 ? "and" : string.Empty;
var remainderGroup = GetGroups(remainder, includeZero: true);
var remainderString = GetString(remainderGroup, includeZero: true);
remainderString = $"{andString} {remainderString}".Trim();
return($"{wholeNumberString} {dollarString} {remainderString} {centsString}".Trim());
}
public decimal Validate(string num)
{
if (!decimal.TryParse(num, out var number))
{
throw new ArgumentException("Invalid argument value (expected decimal).");
}
if (number <= 0)
{
throw new ArgumentException("Invalid argument value (expected positive number).");
}
if (number > 2000000000)
{
throw new ArgumentException("Invalid argument value (expected less than 2 billion).");
}
NumberParser.GetWholeNumber(number, out var remainder);
if (remainder % 1 > 0)
{
throw new ArgumentException("Invalid argument value (expected at most two decimal places).");
}
return(number);
}