Optionals

import Cocoa

var myString:String? = "dd"

if myString != nil {
   println(myString)
}else{
   println("myString has nil value")
}


import Cocoa

/* My first program in Swift */
var myString = "Hello, World!"

println(myString)
typealias Feet = Int
var distance: Feet = 100
println(distance)

typealias Feet1 = Float
var distance1: Feet1 = 200.0099
println(distance1)

var varB:Float

varB = 3.14159
println(varB)

var myString1:String? = nil

if myString1 != nil {
   println(myString)
}else{
   println("myString has nil value")
}