编辑代码

enum Grade{
    case FirstGrade
    case SecondGrade
    case ThirdlyGrade
    case FourthGrade
}


struct Student {
    var name : String
    var number : Int
    var grade : Grade

    init(name:String,number:Int,grade:Grade) {
        self.name = name
        self.number = number
        self.grade = grade
   }
}

let stu = Student(name:"刘辉",number:2020967018,grade:Grade.ThirdlyGrade)
print("\(stu.name),\(stu.number),\(stu.grade)")