Variable , Constant and DataType - Swift3 Coding Tutorial

Open Xcode.Click on Get Started with Playground.Name the playground.Then Create.

Then type following codes or copy it.

import UIKit

//var stands variable and let stands constant

let check: Bool = false

var number:Int = 0

//Explicitly datatype is not required.

var withoutDataType = 7

//you can assign new value to variable

number = 1

//Can not assign new value to constant

//check = true

var name :String = "My name is Sabita"

var money :Float = 33.00

var weight : Double = 33.7987

//Value will naver change to other data type.We can explicitly convert

var moneyString = name + String(money)

var another = "\(name)\(money)"

var dict = [String :Int]()

dict = ["hello" :2,"i" :1,]//At last you can can add , .It is optional

dict["i"] //Access value by its key

let array = [1,2,3,4]