# init(roundingMode:scale:raiseOnExactness:raiseOnOverflow:raiseOnUnderflow:raiseOnDivideByZero:) Returns an `NSDecimalNumberHandler` object initialized so it behaves as specified by the method’s arguments. ``` init(roundingMode: NSDecimalNumber.RoundingMode, scale: Int16, raiseOnExactness exact: Bool, raiseOnOverflow overflow: Bool, raiseOnUnderflow underflow: Bool, raiseOnDivideByZero divideByZero: Bool) ``` ## Parameters `roundingMode` The rounding mode to use. There are four possible values: `NSRoundUp`, `NSRoundDown`, `NSRoundPlain`, and `NSRoundBankers`. `scale` The number of digits a rounded value should have after its decimal point. `exact` If , in the event of an exactness error the handler will raise an exception, otherwise it will ignore the error and return control to the calling method. `overflow` If , in the event of an overflow error the handler will raise an exception, otherwise it will ignore the error and return control to the calling method `underflow` If , in the event of an underflow error the handler will raise an exception, otherwise it will ignore the error and return control to the calling method `divideByZero` If , in the event of a divide by zero error the handler will raise an exception, otherwise it will ignore the error and return control to the calling method ## Return Value An initialized `NSDecimalNumberHandler` object initialized with customized behavior. The returned object might be different than the original receiver. ## Discussion See the [`NSDecimalNumberBehaviors`](/documentation/Foundation/NSDecimalNumberBehaviors) protocol specification for a complete explanation of the possible behaviors. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)