Variables | Swift Programming Language Tutorial

A variable is a storage location which contains some known or unknown quantity or information, a value. The variable name is the way to reference the stored value.

What is a Variable

You can declare a varable in Swift just as you do it in javascript,


var myVariable = 100

You can assign a value of any datatype to variable for example int, char, String or double.


//
//  main.swift
//  Swift Tutorials 2014-15
//  Variables in Swift
//
//
//  Created by Code2care on 15/09/14.
//  Copyright (c) 2014 Code2care. All rights reserved.
//

//integer
var a = 10

//float
var b = 10.10

//String
var c = "Hello, World!"

//Prints a b c variable values
println("\(a) \(b) \(c)");

Output :

10 10.1 Hello, World!
Program ended with exit code: 0

You can re-asign a value to a variable,


//
//  main.swift
//  Swift Tutorials 2014-15
//  Variables in Swift
//
//
//  Created by Code2care on 15/09/14.
//  Copyright (c) 2014 Code2care. All rights reserved.
//





//integer
var a = 10

println("Value of a : \(a)");



var a = 59

println("Value of a : \(a)");

Output :

Value of a : 10
Value of a : 59
Program ended with exit code: 0

You can assign multiple variables in a single line as follows,


//
//  main.swift
//  Swift Tutorials 2014-15
//  Variables in Swift
//
//
//  Created by Code2care on 15/09/14.
//  Copyright (c) 2014 Code2care. All rights reserved.
//





//integer
var a = 10, b = 20, c = 30

println("Value of a : \(a)");

Output :

Value of a : 10
Program ended with exit code: 0