程序解析:1public struct student2{3string sName;4private bool bSex;5public int iNumber;6}78static void Main(string[] args)9{10student stu= new student();11stu.sName = "张三";12stu.bSex = true;13stu.iNumber = 1;14Console.WriteLine("{0}的性别是{1},学号是{2}", stu.sName, stu.bSex, stu.iNumber);15}以上程序不能正常运行,需要在第________行前面添加_______________,需要将第________行的______________换成____________。