Swift 控制語句

條件控制： if 和 Switch

循環(huán)控制：for-in, for, while, and do-while

1  參考代碼如下：       

        let classScore = [100,90,80,70,60,50,40,30]

        var totalScore = 0

        for score in classScore{

            if score >= 60 {

                totalScore += score

            } else {

                println("no pass,score is \(score)" );

            }

        }

        println("totalScore is \(totalScore)");

 2  switch case 循環(huán)，不再限定類型：

            let vegetable = "Switch case Type"

            var result = ""

            switch vegetable{

                case "calery":

                     result = "calery"

                case "calendar","china":

                     result = "china"

                case let x where x.hasSuffix("Type"):

                     result = "haSuffix";

                default :

                     result = "default"

            }

            println("result :\(result)")

3  使用for－in 遍歷字典：

        let interestingNumbers = [

            "Prime": [2, 3, 5, 7, 11, 13],

            "Fibonacci": [1, 1, 2, 3, 5, 8],

            "Square": [1, 4, 9, 16, 25],

        ]

        var largest = 0

        for (kind, numbers) in interestingNumbers {

            for number in numbers {

                if number > largest {

                    largest = number

                }

            }

        }

        println("largest:\(largest)");

4     while 和 do while代碼如下：

• var n = 2

• while n < 100 {

•    n = n * 2

• }

• 
  

• var m = 2

• do {

•    m = m * 2

• } while m < 100

• 
  

5 for循環(huán)如下：  

                var firstLooper = 0;

                for i in 0..3{

                    println("firstLooper:\(i)")

                    firstLooper += 1;

                }

                var secondLopper = 0;

                for var i = 0;i < 3 ; ++i{

                    println("secondLopper:\(i)")

                    secondLopper += 1;

                }

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