条件所限，只能在WINDOWS上学习SWIFT的基本语法。

还有，有swift for windows 1.9帮忙，

看书没那么燥。。。。

struct Resolution {
	var width = 0
	var height = 0
}

class VideoMode {
	var resolution = Resolution()
	var interlaced = false
	var frameRate = 0.0
	var name: String?
}

let someResolution = Resolution(width: 640, height: 480)
let someVideoMode = VideoMode()

print("The width of someResolution is \(someResolution.width)")

someVideoMode.resolution.width = 1280
print("The width of someVedioMode is \(someVideoMode.resolution.width)")

let hd = Resolution(width: 1920, height: 1080)
var cinema = hd
cinema.width = 2048

print("cienma is now \(cinema.width) pixels wide")
print("hd is still \(hd.width) pixels width")

enum CompassPoint {
	case North, South, East, West
}

var currentDirection = CompassPoint.West
let rememberedDirection = currentDirection
currentDirection = .East
if rememberedDirection == .West {
	print("The remembered direction is still .West")
}

let tenEighty = VideoMode()
tenEighty.resolution = hd
tenEighty.interlaced = true
tenEighty.name = "1080i"
tenEighty.frameRate = 25.0

let alsoTenEighty = tenEighty
alsoTenEighty.frameRate = 30.0

print("The frameRate property of tenEighty is now \(tenEighty.frameRate)")