[SWIFT]變數交換，透過第三個變數來達到變數交換的功能

//Define your name as a constant that constant name is myName, type: String

//Define your age as a constant that constant name is age, type: Int

//Define your height as a constant that name is height, type: Double

//Print “ Hello, my name is ______, I am ＿＿＿years old. I am _____ cm tall.”

let myName: String = "PiHan"

let age: Int = 37

let height: Double = 180.0

print("Hello: my name is \(myName). I am \(age) years old. I am \(height) cm tall.")

// 變數交換: 假設有 a,b 兩個變數(常數)，請交換兩者的值

var a = 0

var b = 1

print("a: \(a) b:\(b)")

var c = a

a = b

b = c

print("a: \(a) b:\(b)")

結語：通過第三方變數暫存交換中的值來達到交換的目的