Swift学习——使用if和switch来进行条件操作,使用for,while,和do-while来进行循环
//switch支持任意类型的数据以及各种比较操作——不仅仅是整数以及测试相等
//注意如果去掉default程序会报错
let strings = "hello3" switch strings{ case "hello1": let stringsComment = "say hello1" println("stringsComment is \(stringsComment)") break case "hello2","hello3": let stringsComment = "say hello2 and hello3" println("stringsComment is \(stringsComment)") break case let x where x.hasSuffix("hello4"): let stringsComment = "Is it a spicy \(x)?" println("stringsComment is \(stringsComment)") break default: let stringsComment = "say everything" println("stringsComment is \(stringsComment)") }
简单的while和do-while循环
// while循环 var n = 3 while n < 100{ n = n*2 } println("n is \(n)") //do-while循环 var m = 3 do{ m = m*2 }while m < 100 println("m is \(m)")
stringsComment is say hello2 and hello3
n is 192
m is 192
Swift学习——使用if和switch来进行条件操作,使用for,while,和do-while来进行循环(三),布布扣,bubuko.com
Swift学习——使用if和switch来进行条件操作,使用for,while,和do-while来进行循环(三)
原文:http://blog.csdn.net/jingjingxujiayou/article/details/36908457