---
title: "init(_:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/uint32/init(_:)-c1wd"
---

# init(_:)

Creates a new instance from the given integer.

## Declaration

```swift
init<T>(_ source: T) where T : BinaryInteger
```

## Parameters

- `source`: A value to convert to this type of integer. The value passed as source must be representable in this type.

## Discussion

Discussion Use this initializer to convert from another integer type when you know the value is within the bounds of this type. Passing a value that can’t be represented in this type results in a runtime error. In the following example, the constant y is successfully created from x, an Int instance with a value of 100. Because the Int8 type can represent 127 at maximum, the attempt to create z with a value of 1000 results in a runtime error. let x = 100 let y = Int8(x) // y == 100 let z = Int8(x * 10) // Error: Not enough bits to represent the given value