编辑代码

//3.1
var dictStudents : [Int:String] = [:]
dictStudents[2020967017] = "邹徐陈"
dictStudents[2020967018] = "刘辉"
dictStudents[2020967019] = "胡鑫玉"
dictStudents[2020967020] = "吴长豪"
dictStudents[2020967021] = "薛传勇"

print("\(dictStudents)\n")
//3.2
var dictKeys = [Int](dictStudents.keys)

var arrayNumbers = [Int]()
for i in dictKeys{
    arrayNumbers.append(i)
}
arrayNumbers.shuffle()
for i in arrayNumbers{
    if let temp = dictStudents[i]{
        print(i,temp)
    }
}
//3.3
print()
var str = String()
if  arrayNumbers[0] == 2020967018{
    str = "该你回答问题喽！";
    print(str);
}
else{
    str = "还没轮到你，耐心等待哟！";
    print(str);
}
print()
switch arrayNumbers[0] {
   case  2020967018 :
        str = "该你回答问题喽！";
        print(str);
   default : 
        str = "还没轮到你，耐心等待哟！";
        print(str);
}

print()
arrayNumbers[0] == 2020967018 ?  print("该你回答问题喽！") : print("还没轮到你，耐心等待哟！") ;