函数

函数的定义： 函数名，参数，返回值

func 函数名字(参数)->返回值类型

class ViewController: UIViewController {

    overridefunc viewDidLoad() {

        super.viewDidLoad()

        print(eatFoodKind(kind:"apple"))

        drinkWater(name:"who")

  }

    //1.带返回值

    func eatFoodKind(kind:String) ->String {

        return kind;

    }

    //2.不带返回值

    func drinkWater(name:String){

        print("\(name) is DrinkWater")

    }

    overridefunc didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}