[IOS/Swift] 공부 중 따라 친 예제 기록 01

//: Playground - noun: a place where people can play

import UIKit

Int32.max

Int64.max

Int32.min

INT64_MAX

true

false

true == 1

true == 0

true == "a"

true == ""

false == "a"

false == 0

var a1 : Character = "f"

var a2 : Character = ":"

var a3 : Character = "x"

var user = "john"

var indexCount = 24

let maxCount = 100

var message = "\(user) has \(indexCount) message. Capa remaining is \(maxCount - indexCount)"

println(message)

var newLine = "\n"

var aaa = "\\  "

println(maxCount)

indexCount = 1

var userCnt : Int = 10

// 튜플

let myTuple = (10 , 42.1 , "this")

myTuple.0

myTuple.2

myTuple.1

println(myTuple)

let (mInt , _ , mString) = myTuple

println(mInt    )

println(mString)

// optional

var index : Int?

if index != nil {

    println("nil")

}else{

    println("not nil")

    

}

index=3

var treeArray = ["pak","pine","yew","brich" ]

if index != nil {

    println(treeArray[index!])

}

else{

    println("index does not  value" )

    

}

if let myValue = index {

    println(treeArray[myValue])

}

var result: Bool?

var x1 = 10

var y1 = 20

result = x1 < y1

x1..<y1

for var i = 0 ; i < 10 ; i++ {

    println(" >> \(i)")

}

for index in 1...5 {

    println(" >> \(index)")

}