用C#设计一个控制台应用程序，定义若干个学生对象，每个学生对象包括学号、姓名、语文成绩、数学成绩和英语成绩，采用静态成员求各学生的平均分和各门课程的平均分。

using System;

namespace Experiment_3._1
{
    class Program
    {
        static void Main(string[] args)
        {
            Student s1 = new Student(1, "王华", 67, 89, 90);
            Student s2 = new Student(2, "黎明", 68, 90, 91);
            Student s3 = new Student(3, "张兵", 69, 89, 92);
            Student s4 = new Student(4, "王超", 70, 92, 93);
            Console.WriteLine("输出结果");
            s1.disp(); s2.disp(); s3.disp(); s4.disp();
            Console.WriteLine("语文平均分：{0}数学平均分：{1}英语平均分：{2}", Student.avg1(), Student.avg2(), Student.avg3());
            Console.ReadKey();

        }
        class Student
        {
            int no;
            string name;
            int deg1;
            int deg2;
            int deg3;
            static int sum1 = 0;
            static int sum2 = 0;
            static int sum3 = 0;
            static int sn = 0;
            public Student(int n, string na, int d1, int d2, int d3)
            {
                no = n; name = na;
                deg1 = d1; deg2 = d2; deg3 = d3;
                sn++;
            }
            public void disp()
            {//(double)(deg1 + deg2 + deg3)/3
                Console.WriteLine("学号：{0}，姓名：{1}，语文：{2}，数学：{3}，英语：{4}，平均分：{5:f}", no, name, deg1, deg2, deg3, (double)(deg1 + deg2 + deg3) / 3);
            }
            public static double avg1() { return (double)sum1 / sn; }
            public static double avg2() { return (double)sum2 / sn; }
            public static double avg3() { return (double)sum3 / sn; }
        };
    }
}