1.和之前一样

2.代码

  1 //
  2 //  ViewController.swift
  3 //  SwitfLesson_exam
  4 //
  5 //  Created by 薛雨仑 on 14-10-7.
  6 //  Copyright (c) 2014年 Dylan. All rights reserved.
  7 //
  8 
  9 import UIKit
 10 
 11 class ViewController: UIViewController {
 12 
 13     override func viewDidLoad() {
 14         super.viewDidLoad()
 15         
 16         // 1.
 17         // Change Two temper
 18         // 2种元组的初始化
 19         var a = "Alice"
 20         var b = "Dylan"
 21         var myType = (a, b)
 22         
 23         var name:String
 24         var family:String
 25         (name, family) = ("Alice", "Dylan")
 26         
 27         // test func change
 28         swap(&a, with: &b)
 29         PRintln(a)
 30         println(b)
 31         
 32         // 2.
 33         // print String
 34         // test func flexString
 35         println(flexStrings(s1:"Alice ", s2: "Dylan"))
 36         
 37         // 3.
 38         // sumAny
 39         // test func sumAny
 40         println(sumAny(1, 2, 3))
 41         
 42         // 4.
 43         // countFrom
 44         // test func countFrom
 45         countFrom(from: 1, to: 5)
 46     }
 47     
 48     /**
 49     1. fun change
 50     交换2个任意对象的值
 51     */
 52     func swap<T>(inout a:T, inout with b:T) {
 53         (a, b) = (b, a)
 54     }
 55     
 56     /**
 57     2. func flexStrings
 58     输出字符串
 59     */
 60     func flexStrings(s1:String = "", s2:String = "") ->String {
 61         return s1 + s2 == "" ? "none" : s1+s2
 62     }
 63     
 64     /**
 65     3. func sumAny
 66     */
 67     func sumAny(anys: Any...) ->String {
 68         return String(
 69             (anys.map({item in
 70                 switch item {
 71                 case "" as String, 0 as Int:
 72                     return -10
 73                 case let s as String where s.toInt() > 0:
 74                     return s.toInt()!
 75                 case is Int:
 76                     return item as Int
 77                 default:
 78                     return 0
 79                 }
 80             }) as [Int]).reduce(0, combine: {
 81                 $0 + $1
 82             })
 83         )
 84     }
 85     
 86     /**
 87     4. func countFrom
 88     */
 89     func countFrom(#from: Int, to:Int) {
 90         println(from)
 91         if from < to {
 92             countFrom(from: from + 1, to: to)
 93         }
 94     }
 95 
 96     override func didReceiveMemoryWarning() {
 97         super.didReceiveMemoryWarning()
 98         // Dispose of any resources that can be recreated.
 99     }
100 
101 
102 }