Swift-class, struct, enum

001-Enumeration

//enumeration is not assigned to the default integer value in Swiftenumsomeenumeration { Case North CaseSourth CaseEast CaseWest}//multiple member values to be written in one line, separated by commasenumPlanet { CaseMercury,earth,mars}var Directionhead=someenumeration.west Directionhead=. East//using switch to match a single enumeration value        SwitchDirectionhead { Case. North:print (" North")         Case. Sourth:print ("Sourth")         Case. West:print ("West")         Case. East:print ("East")        default: Print ("None of this Direction")        }

Enumerate associated values

 enum   BarCode { case  UPC (int,int,int,int) //  According to the digital identification commodity  case  qrcode (String) // 
    
    }  
    //  
     Create a barcode  var productbar = BARCODE.UPC (
    8 , 
    8 , 
    3 , 
    4  
    ) Productbar  =. QRCode (
     " 
    abcde  
    " ) 
    // 
    UPC replaced by QRCode  
   

Enumerate original values

//the original value of the enumeration hermit assignmentenumAsciicontrolchar:character { Casetab ="\ t"     Caselinefeed ="\ n"     CaseCarriagereturn ="\ r"}//the default value of the string is the enumeration value itselfenumplanet:int{ CaseMercury =1, Venus,earth,mars}//gets the original value of the enumeration variableLet Earthorder =Planet.earth.rawValue Print (earthorder)//output is 3

Enumerate recursion

//Enumerate recursionIndirectenumArithmetic { CaseNumber (Int) Caseaddition (arithmetic,arithmetic) Casemultiplication (arithmetic,arithmetic)}//Create an enumeration recursive expressionLet five = Arithmetic.number (5) let four= Arithmetic.number (4) Let sum=Arithmetic.addition (five, four) let product=arithmetic.multiplication (sum, five)//(5+4) * 5Print (product)

Class

// declaration of the class: class student{    ""    // access Properties   "  Kid "   print (classitem.name)// Kid

//Structure :

// Structural Body struct Teacher {    ""    = teacher () print (myteacher)/ /Teacher (name: "", age:20)

Swift-class, struct, enum