[Swift 官方教程]09 结构体和类

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()
let someVideoMode = VideoMode()

someResolution.width
someVideoMode.interlaced

let vga = Resolution(width: 640, height: 480)