Swift3 基本语法

import Foundationprint("Hello, World!")var a = 5var b = 10let c = a+bprint(c,terminator:" ")var s = "hello xjc"s = "\(s) \(100)"print(s)var arr = ["hello":"xjc","he":"world"]print(arr["hello"])var arr1 = [String]()for index in 0...100{    arr1.append("Item \(index)")}//for value in arr1{//print(value)//}//var i = 0//while i<arr1.count{//    print(arr1[i])//    i+=1//}func sayHello(name:String){    print("Hello \(name)")}func getNums()->(Int,Int){    return(2,3)}sayHello(name:"xjc")let(a1,a2) = getNums()print(a1)print(a2)class Person{    var _name:String = ""    init(name:String){        _name = name;        print("hi \(_name)")    //    }    func sayhel(){        print("hi \(_name)")    }}    var person = Person(name:"ws")//person._name = "ws"//print(person._name)person.sayhel()//继承class Student: Person{    override func sayhel() {        super.sayhel()        print("hihi")    }}var s1 = Student(name:"xjc");//s1._name = "ws"s1.sayhel()//类功能的扩展extension Student{    func sayHa(){        print("haha")    }}class ha:Student{    }var ha1 = ha(name:"1")ha1.sayhel()//使用接口protocol People{    func getName()->String}class Man:People{    func getName() -> String {        return "xjc"    }}var m1 = Man()print("name is \(m1.getName())")//命名空间class com{    class xjc{    }}extension com.xjc{    class Hi{    func sayHi(){    print("hi xjc")    }    }}extension com.xjc{    class Hello{    func sayHello(){    print("hello xjc")    }    }}var h = com.xjc.Hi()h.sayHi()var h1 = com.xjc.Hello()h1.sayHello()//定位错误class Math{    class func max(a:Int,b:Int)->Int{        NSLog("aaa")        if a>b{            print("aaa")            return a        }else{            print("vbbb")             return b                }    }}var maxNum = Math.max(a: 2,b: 5)print("\(maxNum)")//print("\(max(2,3))")var max_num = max(3,4)//print(max_num)