要求：
1.字段包括姓名、性别、身高、年龄、学生人数count等信息；
2.方法包括设置以上字段的方法setinfo()和显示类的各个字段信息display()。
3.编写构造函数，完成对象初始化操作。
4.构造函数的重载。
5.编写一个变性手术的方法，用于改变已知学生的性别，即男性变女性或女性变男性
求帮写下代码，谢谢

谢了啊

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 实验五案例一
{
    class student
    {
        private string name;
        private string sex;
        private double hight;
        private int age;
        static private int count=0;
        public student()
        {
            count++;
        }
        public student(string name, string sex, double hight, int age)
        {
            this.name = name;
            this.sex = sex;
            this.hight = hight;
            this.age = age;
            count++;
        }
        public void setinfo(string name, string sex, double hight, int age)
        {
            this.name = name;
            this.sex = sex;
            this.hight = hight;
            this.age = age;
        }
        public void display()
        {
            Console.WriteLine("性名：{0}\n性别：{1}\n身高：{2}\n年龄：{3}\n学生总人数：{4}",name,sex,hight,age,count);
        }
        static public void display(student []a)
        {
            foreach (student S in a)
            {
                S.display();
                Console.WriteLine();
            }
        }
        static public student changesex(student a)
        {
            if(a.sex=="男")
            {
                a.sex="女";
            }
            else
                a.sex="男";
            return a;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            student S1 = new student();
            student S2 = new student("李四", "男", 173.5, 20);
            student[] S = new student[2];
            S[0] = new student("张三", "男", 172, 11);
            S[1] = new student("李四", "男", 171, 12);
            S1.setinfo("张三","男",174,21);
            student.changesex(S1);
            S1.display();
            Console.WriteLine();
            S2.display();
            Console.WriteLine();
            student.display(S);
            Console.ReadLine();
        }
    }
}