定义Teacher（教师）类和Cadre（干部）接口，再定义Teacher_Cadre(教师兼干部）类以继承Teacher类和实现Cadre接口。
要求：1.在Teacher类中包括变量成员Name(姓名)，Sex（性别），Age（年龄），Tttle(职称)，Add（地址），Tel(电话）和方法成员Display用以输出教师的姓名，性别，电话。2.在Cadre接口中包括属性成员Post(职务）3.用Teacher_Cadre类的方法成员Show调用Teacher类中的Display方法，输出教师的姓名，性别，年龄，职务，地址，电话。4.用来测试类和接口功能的方法Main必须放在Teacher_Cadre类中。

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

namespace 面向对象练习
{
    public interface Cadre
    {
        string Post
        {
            
            get;
        }
    }
    public class Teacher
    {
        string name;
        string sex;
        int age;
        string title;
        string address;
        int tel;
        public Teacher() { }
        public Teacher(string name, string sex, int age, string title, string address, int tel)
        {
            this.name = name;
            this.sex = sex;
            this.age = age;
            this.title = title;
            this.address = address;
            this.tel = tel;
        }
        public void Display()
        {
            Console.WriteLine( "姓名:{0},性别:{1}年龄:{2}职称:{3}地址:{4}电话:{5}",name,sex ,age ,title ,address ,tel );
        }
    }
    public class Teacher_Cadre : Teacher, Cadre
    {
        public Teacher_Cadre(string name, string sex, int age, string title, string address, int tel)
            : base(name,sex, age, title, address, tel)
        {
 
        }
        public string Post
        {

            get { return "经理："; }
        }
        public void Show()
        {
           Console.Write("职务：{0}",Post);
            Display();
        }


        static void Main(string[] args)
        {
            Teacher_Cadre tom = new Teacher_Cadre("tom","男",20,"经理","广东",123456);
            tom.Show();
        }
    }
    }

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

namespace 面向对象练习
{
    public interface Cadre
    {
        string Post
        {
            
            get;
        }
    }
    public class Teacher
    {
       private string name;
       public string Name
       {
          get{return name;}
          set{name=value;}
        }
       private string sex;
        public string Sex
       {
          get{return sex;}
          set{sex=value;}
        }

       private int age;
       public int Age
       {
          get{return age;}
          set{age=value;}
        }

       private string title;
       public string Title
      {
          get{return title;}
          set{title=value;}
        }

       private string address;
       public string Address
       {
          get{return address;}
          set{address=value;}
        }

       private int tel;
       public int Tel
       {
          get{return tel;}
          set{tel=value;}
        }

        public Teacher() { }
        public Teacher(string name, string sex, int age, string title, string address, int tel)
        {
            this.Name = name;
            this.Sex = sex;
            this.Age = age;
            this.Title = title;
            this.Address = address;
            this.tel = tel;
        }
        public void Display()
        {
            Console.WriteLine( "姓名:{0},性别:{1}年龄:{2}职称:{3}地址:{4}电话:{5}",name,sex ,age ,title ,address ,tel );
        }
    }
    public class Teacher_Cadre : Teacher, Cadre
    {
        public Teacher_Cadre(string name, string sex, int age, string title, string address, int tel)
            : base(name,sex, age, title, address, tel)
        {

        }
        public string Post
        {

            get { return "经理："; }
        }
        public void Show()
        {
           Console.Write("职务：{0}",Post);
            Display();
        }


        static void Main(string[] args)
        {
            Teacher_Cadre tom = new Teacher_Cadre("tom","男",20,"经理","广东",123456);
            tom.Show();
        }
    }
    }