Data Types in Swift Language
Integers i.e. Int: 1, 2, 3, 199, 1000
Float & Doubles: 3.14, 1.168, M_PI
Boolean Values like Bool: true or false
Collection of Characters like Strings: “iOS Development”, “Apple”, “1.2”
We can create our own data type using keywords Struct & Class.
All About Variables
Here is how we declare Variables in Swift: First we start with ‘var’ keyword then ‘Identifier Name’ & ‘Initial Value’
Here is how to Declare Integer values: Int
var thisYear = 2017 var ourAge = 20
Here is how to Declare Empty Integer
var emptyInteger = Int()
Here is how to Declare String
var courseName = "iOS Development" var language = "Swift" var software = "Xcode"
Here is how to Declare Empty String
var emptyString = String()
Here is how to Declare Double or Float
var currentSwiftVersion = 3.0
Here is how to Declare Empty Double or Floating point variable
var emptyDouble = Double()
Here is how to Declare Boolean Value: Bool
var programmingIsFun = true
Here is how to Declare Empty Boolean value
var emptyBoolean = Bool()
Important thing to remember: Swift compiler knows type of variable when you declare them as types of variables are inferred by compiler.
All About Constants: Value of constant never change & it will help you to protect that keyword from anyone changing that value.
Here is how declare Constants in Swift: You will start ‘Let’ Keyword then ‘Identifier name’ equal sign & Constant Value
Here is how to Declare Integer constant: Int
let thisYear = 2017 let ourAge = 20
Here is how to Declare String constant
let courseName = "iOS Development" let language = "Swift" let software = "Xcode"
Here is how to Declare Double or Float constant
let currentSwiftVersion = 3.0
All about Operators available in Swift Language that you can use.
Assignment Operator is ‘=’ which will help you to assign value to ‘identifier name’ for your keyword
Arithmetic Operators available in Swift
Addition Operator: ‘+’
Subtraction Operator: ‘-’
Multiplication Operator: ‘*’
Division Operator: ‘/’
Modulus Operator: ‘%’
Using Arithmetic Operators
var addition = 3 + 8 // Result is 11 var subtraction = addition - 10 // Result is 1, As addition value declared in above line is 11 then it subtract value 10 from addition value & assign it to subtraction keyword subtraction = subtraction + 10 // Result is 11 subtraction += 5 // Result is 16
var division = 10 / 2 // Result is 5 var remainder = division % 5 // Result is 1
I hope This information helps you to get started with Swift Programming Language & clear all your doubts about data types, variable & constants.
Thanks & Regards