Swift简单值练习

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//变量常量

 var a = 7        let b = 5        print(a)        println(a+b)                println("--------------------------------------")

hello world712

//字符串占位符

        let apples = 3        let oranges = 5        let appleSummary = "I have \(apples) apples."        let fruitSummary = "I have \(apples + oranges) pieces of fruit."        println(appleSummary)        println(fruitSummary)        var d = a+b        println(d)                println("--------------------------------------")

I have 3 apples.I have 8 pieces of fruit.12--------------------------------------

//数组

        var TFList = ["first","second","third"]        //替换第三个element        TFList[2] = "hello world"        for list in TFList{            println(list)        }        println("--------------------------------------")

--------------------------------------firstsecondhello world

//字典

 var TFDic = ["age":"24",                     "grade":"man"]        //插入赋值        TFDic["country"] = "china"        for dic in TFDic{            println(dic)        }

(grade, man)(country, china)(age, 24)

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