C#运算符重载

using System;
using System.Collections;
using System.Collections.Generic;

namespace Csharp
{
    struct Vector
    {
        public double x, y, z;

        public Vector(double x, double y, double z)
        {
            this.x = x;
            this.y = y;
            this.z = z;
        }

        public Vector(Vector rhs)
        {
            x = rhs.x;
            y = rhs.y;
            z = rhs.z;
        }

        public override string ToString()
        {
            return "( " + x + " , " + y + " , " + z + " )";
        }
        // "+"运算符重载
        public static Vector operator +(Vector lhs, Vector rhs)
        {
            Vector result = new Vector(lhs);
            result.x += rhs.x;
            result.y += rhs.y;
            result.z += rhs.z;

            return result;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Vector vect1, vect2, vect3;

            vect1 = new Vector(3.0, 3.0, 1.0);
            vect2 = new Vector(2.0, -4.0, -4.0);
            vect3 = vect1 + vect2;

            Console.WriteLine("vect1 = " + vect1.ToString());
            Console.WriteLine("vect2 = " + vect2.ToString());
            Console.WriteLine("vect3 = " + vect3.ToString());

            Console.ReadKey();
        }       
    }  
}