---
title: "init(decodingCString:as:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/substring/init(decodingcstring:as:)"
---

# init(decodingCString:as:)

Creates a string from the null-terminated sequence of bytes at the given pointer.

## Declaration

```swift
init<Encoding>(decodingCString nullTerminatedCodeUnits: UnsafePointer<Encoding.CodeUnit>, as sourceEncoding: Encoding.Type) where Encoding : _UnicodeEncoding
```

## Parameters

- `nullTerminatedCodeUnits`: A pointer to a sequence of contiguous code units in the encoding specified in sourceEncoding, ending just before the first zero code unit.
- `sourceEncoding`: The encoding in which the code units should be interpreted.