虚方法与重写虚方法

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

namespace li2_5
{
    public class Employee
    {
        private double bsalary=1500;
        private double psalary;
        private int n;
        public int N
        {
            get { return n; }
            set { n = value; }
        }
        public virtual double Esalary()
        {
            Console.Write("请输入该员工进公司的年数:");
            N = int.Parse(Console.ReadLine());
            psalary =bsalary*(Math.Pow((1+0.2),(N-1)));
            return psalary;
        }
    }
    public class BachelorEmp : Employee
    {
        public override double Esalary()//通过在与基类虚方法同名的方法前使用override关键字，实现对基类虚方法的重写。
        {
            Console.WriteLine("计算机本科生员工的工资");
            return 1.5 * base.Esalary();
        }
    }
    public class MasterEmp : Employee
    {
        public override double Esalary()
        {
            Console.WriteLine("计算机硕士生员工的工资");
            return 2 * base.Esalary();
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Employee e1 = new Employee();
            Console.WriteLine("该员工的实际工资为:{0}", e1.Esalary());
            BachelorEmp b1 = new BachelorEmp();
            e1 = b1;//使得e1和b1具有相同的派生类类型BachelorEmp
            Console.WriteLine("该员工的实际工资为:{0}", e1.Esalary());
            MasterEmp m1 = new MasterEmp();
            e1 = m1;
            Console.WriteLine("该员工的实际工资为:{0}", e1.Esalary());
        }
    }
}