---
title: "random(in:using:)"
framework: swift
role: symbol
role_heading: Type Method
path: "swift/float80/random(in:using:)-lxqd"
---

# random(in:using:)

Returns a random value within the specified range, using the given generator as a source for randomness.

## Declaration

```swift
static func random<T>(in range: Range<Self>, using generator: inout T) -> Self where T : RandomNumberGenerator
```

## Parameters

- `range`: The range in which to create a random value. range must be finite and non-empty.
- `generator`: The random number generator to use when creating the new random value.

## Return Value

Return Value A random value within the bounds of range.

## Discussion

Discussion Use this method to generate a floating-point value within a specific range when you are using a custom random number generator. This example creates three new values in the range 10.0 ..< 20.0. for _ in 1...3 {     print(Double.random(in: 10.0 ..< 20.0, using: &myGenerator)) } // Prints "18.1900709259179" // Prints "14.2286325689993" // Prints "13.1485686260762" The random(in:using:) static method chooses a random value from a continuous uniform distribution in range, and then converts that value to the nearest representable value in this type. Depending on the size and span of range, some concrete values may be represented more frequently than others. note: The algorithm used to create random values may change in a future version of Swift. If you’re passing a generator that results in the same sequence of floating-point values each time you run your program, that sequence may change when your program is compiled using a different version of Swift.