---
title: "CFNumberCompare(_:_:_:)"
framework: corefoundation
role: symbol
role_heading: Function
path: "corefoundation/cfnumbercompare(_:_:_:)"
---

# CFNumberCompare(_:_:_:)

Compares two CFNumber objects and returns a comparison result.

## Declaration

```swift
func CFNumberCompare(_ number: CFNumber!, _ otherNumber: CFNumber!, _ context: UnsafeMutableRawPointer!) -> CFComparisonResult
```

## Parameters

- `number`: The first CFNumber object to compare.
- `otherNumber`: The second CFNumber object to compare.
- `context`: Pass NULL.

## Return Value

Return Value A CFComparisonResult constant that indicates whether number is equal to, less than, or greater than otherNumber.

## Discussion

Discussion When comparing two CFNumber objects using this function, one or both objects can represent a special-case number such as signed 0, signed infinity, or NaN. The following rules apply: Negative 0 compares less than positive 0. Positive infinity compares greater than everything except itself, to which it compares equal. Negative infinity compares less than everything except itself, to which it compares equal. If both numbers are NaN, then they compare equal. If only one of the numbers is NaN, then the NaN compares greater than the other number if it is negative, and smaller than the other number if it is positive.