---
title: "init(roundingMode:scale:raiseOnExactness:raiseOnOverflow:raiseOnUnderflow:raiseOnDivideByZero:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsdecimalnumberhandler/init(roundingmode:scale:raiseonexactness:raiseonoverflow:raiseonunderflow:raiseondividebyzero:)"
---

# init(roundingMode:scale:raiseOnExactness:raiseOnOverflow:raiseOnUnderflow:raiseOnDivideByZero:)

Returns an NSDecimalNumberHandler object initialized so it behaves as specified by the method’s arguments.

## Declaration

```swift
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 doc://com.apple.documentation/documentation/Swift/true, 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 doc://com.apple.documentation/documentation/Swift/true, 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 doc://com.apple.documentation/documentation/Swift/true, 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 doc://com.apple.documentation/documentation/Swift/true, 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

Return Value An initialized NSDecimalNumberHandler object initialized with customized behavior. The returned object might be different than the original receiver.

## Discussion

Discussion See the NSDecimalNumberBehaviors protocol specification for a complete explanation of the possible behaviors.