A variable provides us with named storage that our programs can operate. Variable names cannot contain mathematical symbols, arrows, private-use (or invalid) Unicode code points, or line- and box-drawing characters nor can they begin with a number, although numbers may be included elsewhere within the name.

Variable Declaration in Swift

A variable declaration tells the compiler of which type, where and how much to create the storage for the variable. Declarations of variables are made using the var keyword.


import Cocoa

var firstvar = 68


The output of the above code snippet will be:



Type Annotations

Programmers can supply a type annotation when they declare a variable, to be clear about the kind of value(s) that the declared variable can store. The general form of using this variable is:


var variableName:<data type> = <optional initial value>


import Cocoa

var firstvar = 68

println (firstvar)

var secVar:Float

secVar = 3.14159

println (secVar)

println(" 1st Value \(varA) 2nd Value \(varB) ")

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