复数

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication28{    class Program    {        static void Main(string[] args)        {            Complex numb1 = new Complex();            numb1.actual = 1;            numb1.sham = 2;            Complex numb2 = new Complex();            numb2.actual = 3;            numb2.sham = 4;            Console.WriteLine(numb1.CAdd(numb2 ));            Console.WriteLine(numb1.CSub(numb2 ));            Console.Read ();        }    }    class Complex     {        public double actual;        public double sham;        public string CAdd(Complex c)        {            double a;            double b;            string d = "";            a = actual + c.actual;            b = sham + c.sham;            if (a > 0) d += "+";            d += a.ToString();            if (b > 0) d += "+";            d += b.ToString();            d += "i";            return d;        }        public string CSub(Complex c)        {            double a;            double b;            string d = "";            a = actual - c.actual;            b = sham - c.sham;            if (a > 0) d += "+";            d += a.ToString();            if (b > 0) d += "+";            d += b.ToString();            d += "i";            return d;        }    }}<img src="http://img.blog.csdn.net/20141216200218891?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvWVVKSU5USUFP/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />