2.1.1、数据类型练习
//: Playground - noun: a place where people can play
importUIKit
//1、var string="my name is Tina"将string按字母顺序排序
varstring="my name is Tina"
//let stringArray = string.characters.sorted {$0 < $1}
//print(stringArray)
//var stringRange = ""
//for character in stringArray
//{
//stringRange.append(character)
//}
//print(stringRange)
//print(string)
vararrayStrs:Array = []
for(index,char)instring.characters.enumerated() {
arrayStrs.append(String(char))
}
print(arrayStrs)
letcmp:(_a:String,_b:String) ->Int= {
(a,b)in
letx = a.compare(b)
ifx == .orderedAscending{//升序
return-1
}elseifx == .orderedSame{//相同
return0
}else{
return1
}
}
cmp("b","a")
foriin1..
forjin0..
ifcmp(arrayStrs[j],arrayStrs[j+1]) ==1{
lettemp =arrayStrs[j]
arrayStrs[j] =arrayStrs[j+1]
arrayStrs[j+1] = temp
}
}
}
varnewResult:String=""
foriinarrayStrs{
newResult+=i
}
print(arrayStrs,newResult)
//2、var bigArray=[4,6,1,3,2,5]进行排序，用三种方法
varresultArray = [String]()
varbigArray=[4,6,1,3,2,5]
//bigArray.sort()
foriin1..
{
forjin0..< (bigArray.count- i)
{
ifbigArray[j] >bigArray[j +1]
{
swap(&bigArray[j], &bigArray[j +1])
//let temp = bigArray[j]
//bigArray[j] = bigArray[j + 1]
//bigArray[j + 1] = temp
}
}
}
print(bigArray)
//3、写一个九九乘法表
/*
1 * 1 = 1
1 * 2 = 22 * 2 = 4
1 * 3 = 32 * 3 = 63 * 3 = 9
1 * 4 = 42 * 4 = 83 * 4 = 124 * 4 = 16
1 * 5 = 52 * 5 = 103 * 5 = 154 * 5 = 205 * 5 = 25
1 * 6 = 62 * 6 = 123 * 6 = 184 * 6 = 245 * 6 = 306 * 6 = 36
1 * 7 = 72 * 7 = 143 * 7 = 214 * 7 = 285 * 7 = 356 * 7 = 427 * 7 = 49
1 * 8 = 82 * 8 = 163 * 8 = 244 * 8 = 325 * 8 = 406 * 8 = 487 * 8 = 568 * 8 = 64
1 * 9 = 92 * 9 = 183 * 9 = 274 * 9 = 365 * 9 = 456 * 9 = 547 * 9 = 638 * 9 = 729 * 9 = 81
*/
foriin1...9{
forjin1...9{//j代表列，i代表行
//print("\(i)*\(j)=\(i*j) ",terminator:"")
ifi>=j {
print("\(j)*\(i)=\(i*j) ",terminator:"")
}
ifj ==9{
print("\n")
}
}
}
//var num = 1
////result为结果
//var result = ""
////外循环循环9次row为行数
//for row in 1...9{
////tmp临时存放结果,外循环执行一次重置一次tmp
//var tmp = ""
////内循环循环num次
//for row in 1..
//tmp = tmp + "\(row)*\(num)=\(row*num)\t"
//
//}
////拼接结果
//result =tmp + "\(row)*\(num)=\(row*num)"
//print(result)
////外循环执行一次需要出现结果的个数+1
//num += 1
//}
//4、编写一个函数可以计算其参数的平均值
funcaverage(a:Double...) ->Any{
varsum:Double=0
foraina{
sum += a
}
returnsum /Double(a.count)
}
average(a:1,2,3,4,5,6)
//5、定义一个数组，写一个函数，传任意数组中的两个元素，可以实现交换数组中的两个元素
vararray = [5,4,3,2,1,0]
swap(&array[0], &array[4])
funcexchangeData(array:Array, a:Int, b:Int) ->Array{
vararray = array
letdata = array[a]
array[a] = array[b]
array[b] = data
returnarray
}
exchangeData(array:array, a:4, b:0)
varoldArray = [5,4,3,2,1,0]
funcjiaohuan (array:Array, a:Int, b:Int) -> (Array){
varneArray = array
swap(&neArray[a],&neArray[b])
returnneArray
}
varanswer:Array=jiaohuan(array:oldArray, a:0, b:5)
funcswapData(_nums:inout[Int],_p:Int,_q:Int) {
lettemp = nums[p]
nums[p] = nums[q]
nums[q] = temp
}
swapData(&oldArray,5,0)
funcswap2(_nums:inout[T],_p:Int,_q:Int) {
(nums[p], nums[q]) = (nums[q], nums[p])
}
swap2(&oldArray,1,3)
//6、将数组[“A”,”B”,”C”]转换为字符串A：B：C
lettimu = ["A","B","C"]
//let zhuanhuan = timu.joined(separator: "：")
vars =""
foriintimu{
ifi !="C"{
s+=String("\(i):")
}else{
s+=String("\(i)")
}
}
print(s)
//6、将课堂上讲的朋友圈的三个数组（用了字典、元组、数组），用所学到的知识，单独获取到“小程序”这个字符串值
//元组
letdataArray1 = [[(image:"0",name:"朋友圈")],[(image:"1",name:"扫一扫"),(image:"2",name:"摇一摇")],[(image:"3",name:"附近的人"),(image:"4",name:"漂流瓶")],[(image:"5",name:"购物"),(image:"6",name:"游戏")],[(image:"7",name:"小程序")]]
letoneSection1 =dataArray1[4]
letoneRow1 =oneSection1[0]
letstring1 =oneRow1.name
print(string1)
//数组
letdataArray2 = [[["0","朋友圈"]],[["1","扫一扫"],["2","摇一摇"]],[["3","附近的人"],["4","漂流瓶"]],[["5","购物"],["6","游戏"]],[["7","小程序"]]]
letoneSection2 =dataArray2[4]
letoneRow2 =oneSection2[0]
letstring2 =oneRow2[1]
print(string2)
//字典
letdataArray3 = [[["image":"0","name":"朋友圈"]],[["image":"1","name":"扫一扫"],["image":"2","name":"摇一摇"]],[["image":"3","name":"附近的人"],["image":"4","name":"漂流瓶"]],[["image":"5","name":"购物"],["image":"6","name":"游戏"]],[["image":"7","name":"小程序"]]]
letoneSection3 =dataArray3[4]
letoneRow3 =oneSection3[0]
letstring3 =oneRow3["name"]
print(string3??"name值不存在")
