作业

main.swift

1 import Foundation
2 
3 //建立1000个女朋友实例，输出其信息和约会语句
4 for var i in 1 ... 1000 {
5     var temp = GirlFriends(name:"(randomName(4))", age:randomAge(18, max:30))
6     print(temp)
7     print(" 第 (i) 名女朋友 (temp.name) 同意和你约会。")
8 }

random func.swift

 1 import Foundation
 2 
 3 //设立随机年龄，范围是18-30
 4 func randomAge(min:Int, max:Int) -> Int {
 5     return (Int(arc4random()) % (max-min+1) + min)
 6 }
 7 
 8 
 9 //设立随机4个字母的名字，范围是 A-Z
10 func random(min:UInt32, max:UInt32) -> UInt32 {
11     return arc4random_uniform(max-min) + min
12 }
13 func randomName(len:Int) -> String {
14     let min:UInt32 = 65
15     let max:UInt32 = 90
16     var string = ""
17     for _ in 0 ..< len {
18         string.append (UnicodeScalar(random(min, max:max)) )
19     }
20     return string
21 }

class-friends.swift

 1 import Foundation
 2 
 3 //建立性别的 enum
 4 public enum Gender:String {
 5     case male
 6     case female
 7 }
 8 
 9 //建立 class Friends
10 public class Friends:NSObject {
11     
12     private var _name   : String
13     private var _age    : Int
14     private var _gender : Gender
15     
16     //初始化
17     init (name:String, age:Int, gender:Gender = Gender.female) {
18         _name   = name
19         _age    = age
20         _gender = gender
21     }
22     
23     // name 的 get 和 set 方法
24     public var name:String {
25         get{
26             return "(_name)"
27         }
28         set{
29             _name = newValue
30         }
31     }
32     
33     // age 的 get 和 set 方法
34     public var age:Int {
35         get{
36             return _age
37         }
38         set{
39             _age = newValue
40         }
41     }
42     
43     // gender 的 get-only 方法
44     public var gender:Gender {
45         get{
46             return _gender
47         }
48     }
49     
50     //重写 description
51     override public var description:String {
52         get{
53             return " 姓名: (name) , 年龄: (age)"
54         }
55     }
56     
57     //建立 date 方法
58     public func date() {
59         print("女朋友(_name)同意和你约会.")
60     }
61 }

subclass-girlfriends.swift

1 import Foundation
2 //建立 Friends 的子类 GirlFriends
3 class GirlFriends:Friends {
4     init(name:String, age:Int) {
5         super.init(name:name, age:age, gender:Gender.female)
6     }
7 }