SWIFT-26-Basics of functions

: Playground-noun:a place where people can playimport uikit//no parameter no return//--void can be omitted or written as () because the return value is null essentially an empty tuple func Run (), Void//() {    print ("I ' m Running")}run ()//non-parametric return func saywelcome (), string{    return "Welcome to play Swift! "} Print (Saywelcome ())//have the parameter return func SayHello (name:string?), string{let    result = "Hello," + (name??). "Guest") + "!"    Return Result}var Nickname:string?print (SayHello (nickname))

　　

SWIFT-26-Basics of functions