2019-11-05

学习swift

第一天

var str = "这是一个严肃的代码"
print(str)
print("现在要做一件严肃的事情",str,"O(∩_∩)O谢谢")
print("开始吧","\ngogogo")
print("这是","一个","美丽的","大汉",separator:",")
print("这是","一个","美丽的","大汉",separator:",",terminator:"棒棒哒\n")
let NUM_COUNT = 255,MAX_MIN = 60
var count = 100
Int8.min
Int8.max

let two: UInt16 = 2_000
let one:UInt8 = 1
let TWO_SUM = two + UInt16(one)
print(TWO_SUM)

let hasKey  = true
if (!hasKey) {
    print("开门")
}else{
    print("(ノ｀Д)ノ滚")
}

var httpErrer = (404,"网络连接失败")
//var <#name#> = <#value#>

let nun = "11111"
let isNun = Int(nun)
if(isNun != nil){
    print("可能是数字：\(String(describing: isNun!))")
}else{
    print("不是的")
}

let a2 = 10,b2 = 2
print("a2 + b2 = \(a2 + b2)")
print("a2 - b2 = \(a2 - b2)")
print("a2 * b2 = \(a2 * b2)")
print("a2 / b2 = \(a2 / b2)")
print("a2 % b2 = \(a2 % b2)")
print("a2 % b2 = \(10 % 3)")

let name = "huhu"
if name != "huhu" {
    print("你好，再见\(name)")
}else{
    print("im so sorry \(name),you is who")
}
let 基本工资 = 8000
let 奖金 = true
var 实际 = 基本工资
if(奖金){
    实际 = 基本工资 + 500
}else{
    实际 = 基本工资
}
print("实际工作 \(实际)")

实际 = 奖金 ? 基本工资 + 500 : 基本工资
print("实际工资 \(实际)")

let def = "red"
var ues:String?
var color = ues ?? def
print(color)
for index in 1...5{
    print("\(index) * 5 = \(index * 5)")
}
let names = ["小一","小二","小三","小四"]
let count = names.count
for i in 0..