Swift Learning -- use if and switch for conditional operations, and use for, while, and do-while for loop (3)

Swift Learning -- use if and switch for conditional operations, and use for, while, and do-while for Loop

// Switch supports any type of data and various comparison operations-not only integers and test equality

// If the default program is removed, an error is returned.

let strings = "hello3"
switch strings{
    case "hello1":
    let stringsComment = "say hello1"
    println("stringsComment is \(stringsComment)")
    break
    case "hello2","hello3":
    let stringsComment = "say hello2 and hello3"
    println("stringsComment is \(stringsComment)")
    break
    case let x where x.hasSuffix("hello4"):
    let stringsComment = "Is it a spicy \(x)?"
    println("stringsComment is \(stringsComment)")
    break
    default:
    let stringsComment = "say everything"
    println("stringsComment is \(stringsComment)")
}

Simple while and do-while Loops

// while loop
var n = 3
while n <100 {
     n = n * 2
}
println ("n is \ (n)")

// do-while loop
var m = 3
do {
     m = m * 2
} while m <100

println ("m is \ (m)") 

Print results

Stringscomment is say hello2 and hello3

N is 192

M is 192