//: Playground - noun: a place where people can play

import UIKit

// 有一个默认参数

//func sayHelloTo( name: String , withGreetingWord greeting: String = "Hello" ) -> String{

//

// return "\(greeting), \(name)!"

//}

//

//sayHelloTo("Playground", withGreetingWord: "Hi")

//sayHelloTo("Playground")

// 有多个默认参数

func sayHelloTo( name: String , withGreetingWord greeting: String = "Hello" , punctuation: String = "!") -> String{

return "\(greeting), \(name)\(punctuation)"

}

sayHelloTo("Playground", withGreetingWord: "Hi", punctuation: "!!!")

// 默认参数顺序变更是可以的，但最好和声明序一样

sayHelloTo("Playground", punctuation: "!!!", withGreetingWord: "Hi")

// 最好将默认参数放在最后, 但不是必须

// 第一个参数含有默认参数值

func sayHello( to name: String = "Playground" , withGreetingWord greeting: String = "Hello" , punctuation: String = "!") -> String{

return "\(greeting), \(name)\(punctuation)"

}

sayHello()

sayHello(punctuation: "!!!", withGreetingWord: "Bye", to: "OC")

// print是一个非常好的有两个默认参数的函数

print("Hello", 1, 2, 3, separator:",", terminator:".")