重载符号的使用

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


/**
 * 
 * 
 * */
class HelloWorld
{

    class Student {
        public decimal price{get;set;}

        //定义重载符号操作内容    
        public static decimal operator -(Student s1, Student s2)
        {
            return s1.price - s2.price;
        }

        
    }
    static void Main(string[] args)
    {
        //重载符号使用
        Student s1 = new Student();
        s1.price = 100;

        Student s2 = new Student();
        s2.price = 500;

        Console.WriteLine(s1-s2);

    }
}