import Foundation println("Hello, World!"); var v1 = 1; var v2 = 2; println(" v1 is \(v1) v2 is \(v2)"); var v3 = v1 + v2; println("v3 is \(v3)"); //字符转换 var v4 : Double = Double(v3) + 3.14; println("v4 is \(v4)"); var v5 = "hello" let v6 = "world" println(v5 + " " + v6); //声明只读类型变量 let v7 = 3.1415; println("v7 is " + String(v7)); var arr = [1,2,4,6]; println("arr index 1 is \(arr[1])"); //声明字典 var airports: Dictionary<String, String> = ["TYO": "Tokyo", "DUB": "Dublin"]; var v8 = "10"; //字符串是否为空 if v8.isEmpty{ println("v8 is true"); } //遍历字符串 for character in "ddd1ew?"{ println("char is " + character) } //字符串长度计算 let unusualMenagerie = "Koala ????, Snail ????, Penguin ????, Dromedary ????" println("unusualMenagerie has \(countElements(unusualMenagerie)) characters") var var9 = countElements(unusualMenagerie) println("var9 lenght is \(var9)") //比较字符串 let quotation = "We're a lot alike, you and I." let sameQuotation = "We're a lot alike, you and I." if quotation == sameQuotation { println("These two strings are considered equal") } //大小写转换 let normal = "Could you help me, please?" let shouty = normal.uppercaseString // shouty 值为 "COULD YOU HELP ME, PLEASE?" let whispered = normal.lowercaseString // whispered 值为 "could you help me, please?" //String 转换 int var i :Int = "1".toInt()! println("\(i)")
原文:http://blog.csdn.net/yin_xianwei/article/details/38013911