编辑代码

class Student{
   var name: String = ""
   var number: Int = 0
   var mark: Int = 0

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

let stu1 = Student(name:"刘辉",number:2020967018,mark:60)
let stu2 = Student(name:"薛传勇",number:2020967020,mark:60)
let stu3 = Student(name:"吴长豪",number:2020967021,mark:60)

var arr:[Student] = [stu1,stu2,stu3]


var temp = Student(name:"",number:0,mark:0)

if temp !== arr[0]{
    temp = arr[0]
    temp.mark = 100
}



for i in arr {
    print(i.number,i.name,i.mark)
}