2017_10_07_kotlin_study - denlyou/AIL GitHub Wiki

Kotlin Language

Reference > Basic > Basic Types

http://kotlinlang.org/docs/reference/basic-types.html

μ½”ν‹€λ¦° λ³€μˆ˜ μ„ μ–Έ

  • var λ³€μˆ˜λͺ…: μžλ£Œν˜•
  • μƒμˆ˜λŠ” val

μžλ£Œν˜•

  • 코틀린은 μžλ°”μ˜ κΈ°λ³Έμžλ£Œν˜•(Primitive Type)이 업이 λͺ¨λ‘ μ°Έμ‘°(객체)νƒ€μž…

숫자(Numbers)

  • μ •μˆ˜ : Long(64-bit), Int(32), Short(16), Byte(8)
  • μ‹€μˆ˜ : Double(64), Float(32)
Literal Constants
  • μ •μˆ˜
    • μ‹­μ§„μˆ˜(Decimals) : 123
    • Longνƒ€μž…μ˜ 경우 숫자 λ§ˆμ§€λ§‰μ— L을 λΆ™μž„ : 123456789L
    • 16μ§„μˆ˜(Hexadecimals)의 경우 λ§¨μ•žμ— 0xλ₯Ό λΆ™μž„ : 0x2202
    • 2μ§„μˆ˜μ˜ κ²½μš°μ—λŠ” λ§¨μ•žμ— 0bλ₯Ό λΆ™μž„ : 0b00001011
    • 8μ§„μˆ˜λŠ” μ§€μ›ν•˜μ§€ μ•ŠμŒ
  • μ‹€μˆ˜
    • 기본은 Doubleνƒ€μž…, Floatνƒ€μž…μ€ λ§ˆμ§€λ§‰μ— fλ‚˜ Fλ₯Ό λΆ™μž„ : 12.3, 12.3f
    • μ§€μˆ˜ν‘œν˜„λ²•μ€ λ§ˆμ§€λ§‰μ— eλ₯Ό μ‚¬μš©ν•΄ ν‘œν˜„ : 12.3e10
μ–Έλ”μŠ€μ½”μ–΄(_) 지원 (μ½”ν‹€λ¦° 1.1 μ΄μƒμ—μ„œ)
  • μˆ«μžμ—λŠ” 영ν–₯을 λ―ΈμΉ˜μ§€ μ•ŠλŠ”λ‹€(숫자 자리수 ꡬ뢄과 같은 μš©λ„λ‘œ μ‚¬μš© κ°€λŠ₯)
val oneMillion = 1_000_000
val creditCardNumber = 1234_5678_9012_3456L
val socialSecurityNumber = 999_99_9999L
val hexBytes = 0xFF_EC_DE_5E
val bytes = 0b11010010_01101001_10010100_10010010