# ExpressibleByIntegerLiteral A type that can be initialized with an integer literal. ``` protocol ExpressibleByIntegerLiteral ``` ## Overview The standard library integer and floating-point types, such as `Int` and `Double`, conform to the `ExpressibleByIntegerLiteral` protocol. You can initialize a variable or constant of any of these types by assigning an integer literal. ``` // Type inferred as 'Int' let cookieCount = 12 // An array of 'Int' let chipsPerCookie = [21, 22, 25, 23, 24, 19] // A floating-point value initialized using an integer literal let redPercentage: Double = 1 // redPercentage == 1.0 ``` # Conforming to ExpressibleByIntegerLiteral To add `ExpressibleByIntegerLiteral` conformance to your custom type, implement the required initializer. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)