enum Point {
case North
case South
}
var d = Point.North
d = .South
switch d {
case .North:
case .South:
}
switch d {
case .North:
default:
}
enum Code {
case UPCA(Int, Int, Int, Int)
case QRCode(String)
}
var pro = Code.UPCA(8, 85909, 51226, 3)
pro = .QRCode("ABCDEFGHIJKLMNOP")
switch pro {
case .UPCA(let a, let b, let c, let d):
print("UPC-A: \(a), \(b), \(c), \(d).")
case .QRCode(let str):
print("QR code: \(str).")
}
switch pro {
case let .UPCA(a, b, c, d):
print("UPC-A: \(a), \(b), \(c), \(d).")
case var .QRCode(str):
print("QR code: \(str).")
}
enum Point {
case North ?= 1
case South
}
var a = Point.North.rawValue ? //1
var b = Week(rawValue: 2)? ? ? //South
遞歸函數
indirect enum Ari {
case Num(Int)
case Add(Ari, Ari)
case Mul(Ari, Ari)
}
func eva_f(ari:Ari) -> Int {
switch ari {
case let .Num(a):
return a
case let .Add(a, b):
return eva_f(a) + eva_f(b)
case let .Mul(a, b):
return eva_f(a) * eva_f(b)
}
}
//(3+4)*6
var a = eva_f(Ari.Mul(Ari.Add(Ari.Num(3),Ari.Num(4)), Ari.Num(6)))
