Swift Variables and functions

Func getnums (),(int,int) {     //swift function can return multiple variables     of Return (2,  3)}let (A,  b) = getnums ()  //let is a constant, once the assignment is immutable, VAR is the variable println (a    )= getnums  //The function is an object that can be used as a variable. Copy to another variable println (f ())     //output (2,3)

Swift declaration variable var name = "Hello"//name will be automatically recognized as String type

or specify variable type: var name:string = "Hello"

Swift uses + to make a string connection, but not + int. If you want to add an int type, you can use the following method:

var i = 200

var str = "Hello"

str = "\ (str), world, \ (i)"//use \ (variable name), str value is hello,world,200

Different data types can be stored in the array

var arr = ["Hello", 100, 2.3]

You can also specify that only the array is stored:

var arr1 = []//define an array

var arr2 = string[] ()//ARR2 array can only store strings

Dictionary:

var dic = ["name": "Zhou", "Age": "16"]

dic["sex"] = "female"//assign a value to the dictionary dynamically

println (DIC)//Output [Sex:female, Name:zhou, Age:16]

println (dic["name"])//Output Zhou

classmath{classFunc Max (A:int, B:int)int{NSLog ("Run Math.max")//print time, and inside the stringif(a>b) {            returnA; }Else{            returnb; }}}var maxnum= Math.max (2B:5) println ("Hello, \ (maxnum)")

Swift Variables and functions