C#运算符重载C#基础学习

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

namespace day01
{
    class Class30
    {
        private int value;
        public int Value { get; set; }
        public Class30()
        {

        }
        public Class30(int value)
        {
            Value = value;
        }
        public static Class30 operator+(Class30 c1,Class30 c2)
        {
            Class30 cTemp = new Class30();
            cTemp.Value = c1.Value + c2.Value;
            return cTemp;
        }
        //static类方法 如何处理
        //该方法是取相反数
        public static Class30 operator -(Class30 c1)
        {
            Class30 cTemp = new Class30();
            cTemp.Value = -c1.Value;
            return cTemp;
        }
        public static Class30 operator -(Class30 c1, Class30 c2)
        {
            Class30 cTemp = new Class30();
            cTemp.Value = c1.Value - c2.Value;
            return cTemp;
        }
        static void Main(string[] args)
        {
            //Class30 c1 = new Class30(100);
            //Class30 c2 = new Class30(100);
            //Class30 c3 = c1 + c2;
            //Console.WriteLine(c3.Value);
            //Console.WriteLine();

            //Class30 c1 = new Class30(200);
            //Class30 c2 = new Class30(100);

            //Class30 c3 = c1 - c2;
            //Console.WriteLine(c3.Value);

            Class30 c1 = new Class30(100);
            Class30 cTemp = -c1;
            Console.WriteLine(cTemp.Value);

            Console.ReadKey();
        }
    }
}