Swift3 基本语法

import Foundation

print("Hello, World!")
var a = 5
var b = 10
let c = a+b
print(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)