条件控制： if 和 Switch

循环控制：for-in,for,while, anddo-while

1 参考代码如下：

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 循环，不再限定类型：

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 遍历字典：

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)");


4while 和 do while代码如下：

var n = 2

while n < 100 {

n = n * 2

}


var m = 2

do {

m = m * 2

} while m < 100


5 for循环如下：

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;

}


下一篇文章将讲解方法、函数