swift

var In:Int = 10
var Do:Double = 10.0
var Str:String = “asd”

let arr:[String] = [“小西”,“小南”,“小北”,“小东”]

for item in arr{

print(item)

}

for i in 0…<arr.count{

print(arr[i])

}

for (index, item) in arr.enumerated(){

print((index, item))

}

let dic:[String:Double] = [“小西”:90.5,“小南”:87.0,“小北”:75.5,“小东”:88.5]

for item in dic.keys{

print(item)

}

for item in dic.values{

print(item)

}

for item in dic{

print((item.key,item.value))

}

func sushu(){

var isPreimNum = true//判断是否是素数的标志，是就是true ，不是就是false

for item in 101...200 {//遍历101到200 中的任意数字
    
    for j in 2..<item { //判断 item是否是素数
        if item % j == 0 {
            isPreimNum = false
            break
        }
        
    }
    if isPreimNum {//如果是素数
        print(item)//打印这个素数
        
    }
    isPreimNum = true
}

}

sushu()

func getStepNumber(n:Int) -> Int {

if 0 > n{
    return 0;
}
if n == 1 {
    return 1;
}

if n == 2 {
    return 2;
}

if n > 2 {
    return getStepNumber(n: n - 1) + getStepNumber(n: n - 2);
}
return 0;

}

let num = getStepNumber(n: 9)
print(num)

func zuheshu(){

var sum1 = 0  //定义变量用于记录个数

for hudder in 3...6 {   //百位
    for ten in 3...6 {  //十位
        for num in 3...6 {  //个位
            if hudder != ten && hudder != num && ten != num {
                print(hudder*100 + ten*10 + num)
                sum1 += 1   //计算个数
            }
        }
    }
}

print(sum1)

}
zuheshu()

let Arr:[String] = [“a”,“b”,“c”,“d”,“e”,“f”,“g”]
let Brr:[String] = [“b”,“d”,“f”,“g”]
var Crr:[Int] = Int

for i in 0…<Arr.count{

for j in 0..<Brr.count{
    
    if Arr[i]==Brr[j]{
        print(i)
       Crr.append(i)
    }
}

}

print(Crr)