【Swift4】(1) 初步认识 | 数据类型

var a =3,b=4,c=5;

var Who:String  //声明一个String的变量Who

Who = "imaginecode"

println(Who)

var apples = 10
var oranges = 4
println("I have \(apples + oranges) fruits") //占位符表示方式

let a: UInt8 =10
let b: Uint6 = 100

print("\(UInt16(a)+b)")

typealias AudioSample = UInt16
var maxValue = AudioSample.min

(true,"imagine","男")
(404,"Not Found")

let registInfo = (isTrue:true,nickname:"imagine",gender:"男")
let (isTrue,nickname,gender) = registInfo
registInfo.isTrue // true

let loginResult = (true,"imagine")
let (isLogin,_) = loginResult
if isLogin {
	print("success")
} 

var imOptionalVariable:Int? //nil
imOptionalVariable = 12 //12