---
title: significandBitPattern
framework: swift
role: symbol
role_heading: Instance Property
path: swift/double/significandbitpattern
---

# significandBitPattern

The raw encoding of the value’s significand field.

## Declaration

```swift
var significandBitPattern: UInt64 { get }
```

## Discussion

Discussion The significandBitPattern property does not include the leading integral bit of the significand, even for types like Float80 that store it explicitly.

## See Also

### Working with Binary Representation

- [bitPattern](swift/double/bitpattern.md)
- [significandWidth](swift/double/significandwidth.md)
- [exponentBitPattern](swift/double/exponentbitpattern.md)
- [significandBitCount](swift/double/significandbitcount.md)
- [exponentBitCount](swift/double/exponentbitcount.md)
- [radix](swift/double/radix.md)
- [init(bitPattern:)](swift/double/init(bitpattern:).md)
- [init(sign:exponentBitPattern:significandBitPattern:)](swift/double/init(sign:exponentbitpattern:significandbitpattern:).md)
- [init(nan:signaling:)](swift/double/init(nan:signaling:).md)
- [Double.Exponent](swift/double/exponent-swift.typealias.md)
- [Double.RawSignificand](swift/double/rawsignificand.md)
- [Double.RawExponent](swift/double/rawexponent.md)