while循环的3个练习

       static void Main(string[] arg){//while的3个练习Console.WriteLine("请输入班级人数:");int intNum = 0;while (!(int.TryParse(Console.ReadLine(), out intNum))){Console.WriteLine("班级人数输入有误, 请重新输入!");};int i = 0;int sum = 0;int score = 0;while (i<intNum){Console.WriteLine("请输入第{0}个学生的成绩", i + 1);while (!(int.TryParse(Console.ReadLine(), out score))){Console.WriteLine("第{0}个同学成绩输入有误, 请重新输入!", i + 1);}sum += score;i++; }Console.WriteLine("{0}个同学的总成绩是{1},平均成绩是{2};", i , sum, sum / i );Console.ReadKey();}