求C#大神，编程关于类及其对象的封装

[u010356531]

编写一个Complex类(复数)，该类中有以下字段
real:复数的实部
imag:复数的虚部
请使用属性对上述字段进行封装，并有以下方法
Add：复数的加法，包括复数与复数的加法，复数与实数的加法。
Subtract：复数的减法，包括复数与复数的减法，复数与实数的减法。
ToString：将复数以a+bi的形式输出。

[图灵狗]

参考以下代码，根据其中+运算符重载，可以简单的编写Add和Subtract函数：

public struct Complex
{
    public int real;
    public int imaginary;

    public Complex(int real, int imaginary)  //constructor
    {
        this.real = real;
        this.imaginary = imaginary;
    }

    // Declare which operator to overload (+),
    // the types that can be added (two Complex objects),
    // and the return type (Complex):
    public static Complex operator +(Complex c1, Complex c2)
    {
        return new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary);
    }

    // Override the ToString() method to display a complex number in the traditional format:
    public override string ToString()
    {
        return (System.String.Format("{0} + {1}radius", real, imaginary));
    }
}

class TestComplex
{
    static void Main()
    {
        Complex num1 = new Complex(2, 3);
        Complex num2 = new Complex(3, 4);

        // Add two Complex objects through the overloaded plus operator:
        Complex sum = num1 + num2;

        // Print the numbers and the sum using the overriden ToString method:
        System.Console.WriteLine("First complex number:  {0}", num1);
        System.Console.WriteLine("Second complex number: {0}", num2);
        System.Console.WriteLine("The sum of the two numbers: {0}", sum);

        // Keep the console window open in debug mode.
        System.Console.WriteLine("Press any key to exit.");
        System.Console.ReadKey();
    }
}
/* Output:
    First complex number:  2 + 3i
    Second complex number: 3 + 4i
    The sum of the two numbers: 5 + 7i
*/

[u010356531]

这就是传说中的大C#神吗！真得很感谢