---
title: ulpOfOne
framework: swift
role: symbol
role_heading: Type Property
path: swift/float16/ulpofone
---

# ulpOfOne

The unit in the last place of 1.0.

## Declaration

```swift
static var ulpOfOne: Float16 { get }
```

## Discussion

Discussion The positive difference between 1.0 and the next greater representable number. The ulpOfOne constant corresponds to the C macros FLT_EPSILON, DBL_EPSILON, and others with a similar purpose.