namespace ConsoleApplication6
{class Program{struct student{public int xuhao;public string xuehao;public string name;public double score;}static void Main(string[] args){ArrayList al = new ArrayList();student x = new student();int biao = 0;Console.Write("请输入班级人数：");int a = int.Parse(Console.ReadLine());for (int i = 0; i < a; i++){int biao1 = 0;x.xuhao = i+1;for (; ; ){Console.Write("请输入第{0}个学生的学号：", i + 1);string xh = Console.ReadLine();if (xh != ""){if (biao == 0){x.xuehao = xh;biao1 = 1;break;}else{for (int k = 0; k < biao; k++){if (((student)al[k]).xuehao == xh){Console.WriteLine("学号输入重复，请重新输入！");break;}else{if (k == biao - 1){x.xuehao = xh;biao1 = 1;break;}else{continue;}}}}}else{Console.WriteLine("输入学号不能为空，请重新输入！");}if (biao1 == 1){break;}}for (; ; ){Console.Write("请输入第{0}个学生的姓名：", i + 1);string name = Console.ReadLine();if (name != ""){x.name = name;break;}else{Console.WriteLine("输入姓名不能为空，请重新输入！");continue;}}Console.Write("请输入第{0}个学生的分数：", i+1 );try{double m = double.Parse(Console.ReadLine());if (m >= 0 && m <= 100){x.score = m;}else{Console.WriteLine("成绩必须在0~100之间！");}}catch{Console.WriteLine("成绩输入有误！");}al.Add(x);}for (int i = 0; i < al.Count - 1; i++){for (int j = i + 1; j < al.Count; j++){student s1 = (student)al[i];student s2 = (student)al[j];if (s1.score < s2.score){student zhong = (student)al[i];al[i] = al[j];al[j] = zhong;}}} Console.WriteLine("==============学生成绩展示=================");Console.WriteLine("序号" + "\t"+"学号" + "\t"+"姓名" + "\t"+"成绩" + "\t");for (int i = 0; i < al.Count; i++){Console.WriteLine(((student)al[i]).xuhao + "\t" + ((student)al[i]).xuehao + "\t" + ((student)al[i]).name + "\t" + ((student)al[i]).score);}Console.ReadLine();}}
}