编辑代码

// var myString = "Hello world!     -  swift.jsrun.net"
// print(myString)


struct Dog{
   var name="na"
   var age = 1
   var ggg:Int {
       get {
           return age
       }
       set {
           age += newValue
       }
   }

   func test() {
    //    self.ggg = 0
    //    age += 10
    ggg = 1
    print("\(ggg)")
    print("age:\(age)")
   }
}
var dog = Dog()
dog.test()
dog.ggg = 3
print(dog.ggg)