Happy Numbers in Swift

happyNumbers.swift

// Happy Numbers
// info: http://en.wikipedia.org/wiki/Happy_number
// by Florian Nagel
// floriannagel.net

import Foundation

func isHappyNumber(var number: Int) -> Bool {
    var history = [Int]()
    
    while number != 1 {
        history.append(number)
        
        var sum: Int = 0
        
        while number != 0 {
            sum += Int(pow(Double(number%10), 2.0))
            number /= 10
        }
        
        number = sum
        
        if contains(history, number) {
            return false
        }
    }
    
    return true
}

func print8HappyNumbers(var start: Int) {
    var found = 0
    
    while found < 8 {
        if isHappyNumber(start) {
            println(start)
            found++
        }
        start++
    }
}


print8HappyNumbers(0)