Swift Overview and Swift operators and expressions

Swift is a new language for designing IOS and Mac OS X applications.

Swift Features

? Swift retains the strengths of C and Objective-c and rejects the restrictions it has imposed in order to be compatible with the C language.

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

? Swift's simple style, combined with the popular, mature framework Cocoa/cocoa Touch, will bring new opportunities to the development process of another conceived software.

? Swift memory management uses ARC style.

Swift code file extension *.swift

Operator

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

+ +,--

? relational operators, >, <, >=, <=, = =,! =

?  Boolean logical operators,! , &&, | |

? Ternary operator,? ：

An expression

1. Do not specify a data type

var A1 = ten 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, can have a semicolon end

var a1:int = 10; var a2:int = var a = a1> A2? "A1": "A2"

Gaze

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Swift Overview and Swift operators and expressions