Swift overview and Swift operators and expressions

Swift is a new language used to design iOS and Mac OS X applications.

Swift features

? Swift retains the advantages of C and Objective-C and abandons the limitations it imposes to be compatible with the C language.

? Swift incorporates the security programming model and adds some modern features to make it easier to use, more flexible, and more fun.

? The combination of Swift's simple and clean style and popular box-ready Cocoa/Cocoa Touch will bring new opportunities for the new software development process.

? Swift memory management adopts the ARC style.

Swift code file extension *. swift

Operator

? Arithmetic Operators, +,-, *,/, %,

++ ,--

? Relational operators,>, <, >=, <=, = ,! =

? Boolean logical operator ,! , &, |

? Ternary operator ,? :

Expression

1. do not specify the Data Type

Var a1 = 10 var a2 = 20

Var a = a1> a2? "A1": "a2"

2. Specify the Data Type

Var a1: Int = 10 var a2: Int = 20

Var a = a1> a2? "A1": "a2"

3. You can end with a semicolon.

Var a1: Int = 10; var a2: Int = 20 var a = a1> a2? "A1": "a2"

Note

//

/**/

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