swift SWIFT中的变量

Posted 2021-05-19

// keyword name: type = value
var myAge : Int = 25

myAge = 26

// constant = let
// EXPLICITLY DEFINING YOUR VARIABLES
let myName : String = "Parm"
let mySurname : String = "Sahadeo"

let myAgeInTenYears = myAge + 10

let myFullName = myName + " Sahadeo"

// Or String interpolation
// Swift is smart enough to know or infer a data types
let myFullNameInterpolated  = "\(myName) \(mySurname)"

let myDetails = "\(myName), \(myAge)"

let boolean : Bool = false
let deci : Float = 12.3
let doubleNum : Double = 12.3434532554

// Printing to the console in swift
var helloName: String = "Hi Parm"

print(helloName)
// => "Hi Parm"