Swift Basics-Variables

(1) Variables and constants

(2) Basic type

(3) Forced conversion

(4) Type bool

(5) Meta-group

(6) Optional value

2. Variables and constants
6. var str = "Hello, Playground"
8. Let Maxnum = 888
12. Specify type
16. var str1:string = "Test"
18. var int1:int = 1
20. var dou1:double = 1.
22. var flo1:float = 1. 111111111111
26. Forced conversions
30. var dou2:double = Double (int1) + Dou1
34. BOOL Type
38. var bool1:bool = true
40. BOOL1 = false
42. if bool1 {
44. println ("I am true")
46. } Else {
48. println ("I am false")
50. }
54. Meta-group
58. var Registionresult = (name:"Name", Age:24,sex:"female")
60. var Connectionresult = ("404","not found!")
62. Registionresult. Age
64. Registionresult. Name
66. Registionresult. Sex
70. var registion: (name:string,age:int,sex:string)
72. Registion. Name = "xxx"
78. Optional values
82. var a:int?
86. A = 12
90. A = "a". ToInt ()
94. println ("Age is" + String (a!))

Swift Basics-Variables