notANumber

Declaration

@NSCopying class var notANumber: NSDecimalNumber { get }

Return Value

An NSDecimalNumber object that specifies no number.

Discussion

Any arithmetic method receiving notANumber as an argument returns notANumber.

This value can be a useful way of handling non-numeric data in an input file. This method can also be a useful response to calculation errors. For more information on calculation errors, see the exceptionDuringOperation(_:error:leftOperand:rightOperand:) method description in the NSDecimalNumberBehaviors protocol specification.

See Also

Creating a Decimal Number

• one
• zero