---
title: "init(_:radix:uppercase:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/string/init(_:radix:uppercase:)"
---

# init(_:radix:uppercase:)

Creates a string representing the given value in base 10, or some other specified base.

## Declaration

```swift
init<T>(_ value: T, radix: Int = 10, uppercase: Bool = false) where T : BinaryInteger
```

## Parameters

- `value`: The value to convert to a string.
- `radix`: The base to use for the string representation. radix must be at least 2 and at most 36. The default is 10.
- `uppercase`: Pass true to use uppercase letters to represent numerals greater than 9, or false to use lowercase letters. The default is false.

## Discussion

Discussion The following example converts the maximal Int value to a string and prints its length: let max = String(Int.max) print("\(max) has \(max.count) digits.") // Prints "9223372036854775807 has 19 digits." Numerals greater than 9 are represented as Roman letters. These letters start with "A" if uppercase is true; otherwise, with "a". let v = 999_999 print(String(v, radix: 2)) // Prints "11110100001000111111"

print(String(v, radix: 16)) // Prints "f423f" print(String(v, radix: 16, uppercase: true)) // Prints "F423F"