---
title: "init(_:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/double/init(_:)-5h7qh"
---

# init(_:)

Creates a new instance that approximates the given value.

## Declaration

```swift
init(_ other: Float)
```

## Parameters

- `other`: The value to use for the new instance.

## Discussion

Discussion The value of other is rounded to a representable value, if necessary. A NaN passed as other results in another NaN, with a signaling NaN value converted to quiet NaN. let x: Float = 21.25 let y = Double(x) // y == 21.25

let z = Double(Float.nan) // z.isNaN == true

## See Also

### Converting Floating-Point Values

- [init(_:)](swift/double/init(_:)-1488d.md)
- [init(_:)](swift/double/init(_:)-o1k9.md)
- [init(_:)](swift/double/init(_:)-aeox.md)
- [init(_:)](swift/double/init(_:)-9z7ob.md)
- [init(_:)](swift/double/init(_:)-7ag2w.md)
- [init(sign:exponent:significand:)](swift/double/init(sign:exponent:significand:).md)
- [init(signOf:magnitudeOf:)](swift/double/init(signof:magnitudeof:).md)
- [init(_:)](swift/double/init(_:)-1oh9r.md)
- [init(truncating:)](swift/double/init(truncating:).md)