運算符重載

最近學校學了運算符重載，雖然很簡單，仍是記錄下，以便於之後忘記和學習。

    class XS
    {
        private double RP;         //實部
        private double IP;         //虛部
        public double getRP
        {
            get { return RP; }
        }
        public double getIP
        {
            get { return IP; }
        }

        public XS()  //構造函數
        {
            RP = IP = 0;
        }
        public XS(double RP, double IP)//構造函數重載
        {
            this.RP = RP;
            this.IP = IP;

        }

        //加號+重載
        public static XS operator +(XS c1, XS c2)
        {
            XS c = new XS(c1.RP + c2.RP, c1.IP + c2.IP);
            return c;
        }

        //對取反符號-重載(一元運算符重載)
        public static XS operator -(XS c)
        {
            XS c2 = new XS(-c.RP, -c.IP);
            return c2;
        }

        //對減號-重載（二元運算符重載）
        public static XS operator -(XS c1, XS c2)
        {
            XS c = new XS(c1.RP - c2.RP, c1.IP - c2.IP);
            return c;
        }

        //實現隱式類型轉換（從 string 到 XS）
        public static implicit operator XS(string s)
        {
            s = s.Trim().TrimEnd('i');
            s = s.Trim().TrimEnd('*');
            string[] digits = s.Split('+', '-');
            XS c;
            c = new XS(Convert.ToDouble(digits[0]), Convert.ToDouble(digits[1]));
            return c;
        }

        //輸出虛數
        public void putOut()
        {
            Console.WriteLine("{0} + {1}*i", RP, IP);
        }
    }

static void Main(string[] args)
        {
            //調用不帶參數的構造函數建立虛數對象c1
            XS c1 = new XS();
            //調用帶參數的構造函數建立虛數對象c2
            XS c2 = new XS(1, 2);
            Console.Write("c1 = "); c1.putOut();
            Console.Write("c2 = "); c2.putOut();
            XS c3;
            c3 = "100+200*i";                 // 經過隱式轉換對c3賦值
            Console.Write("c3 = "); c3.putOut();
            XS c4;
            c4 = -c2 - c1 + c3;                //對對象進行加減運算
            Console.Write("c4 = "); c4.putOut();
            Console.ReadKey();
        }