리터럴 형식 추론

리터럴의 기본 타입

let i = 5
let d = 5.0
let s = "5"
let b = true
print(type(of: i), type(of: d), type(of: s), type(of: b))

let x = 5는 Int

let x = 5
print(type(of: x))
print(x + 1)

let y: Double = 5

let y: Double = 5
print(type(of: y))
print(y / 2)

소수점은 Double을 지정합니다

let z = 5.0
print(type(of: z))
print(z * 2)

Int와 Double은 섞이지 않습니다

let count = 3
let price = 1.5
let total = Double(count) * price
print(total)

Float와 Double

let big = 3.14
let small: Float = 3.14
print(type(of: big), type(of: small))

정수 타입 주석

let tiny: Int8 = 120
let unsigned: UInt = 9
print(type(of: tiny), type(of: unsigned))

String과 Character

let word = "Swift"
let letter: Character = "S"
print(type(of: word), type(of: letter))

불리언 리터럴

let isReady = false
print(type(of: isReady))

표현식 속 리터럴

let mixed = 1 + 2.0
print(mixed)
print(type(of: mixed))

타입 주석에 맞게 변하는 리터럴

let a: Double = 7
let b: Float = 7
print(a, b)

빠른 확인

정리

let i = 5
let d: Double = 5
print(type(of: i), type(of: d))