请教C#中的代码问题

使用运算符重载定义复数相加，相减和相乘的复数类，显示两个复数，和，差，乘积

public class Complex
{
    public double Real { get; set; }
    public double Imaginary { get; set; }

    public Complex(double real, double imaginary)
    {
        Real = real;
        Imaginary = imaginary;
    }

    public static Complex operator +(Complex c1, Complex c2)
    {
        return new Complex(c1.Real + c2.Real, c1.Imaginary + c2.Imaginary);
    }

    public static Complex operator -(Complex c1, Complex c2)
    {
        return new Complex(c1.Real - c2.Real, c1.Imaginary - c2.Imaginary);
    }

    public static Complex operator *(Complex c1, Complex c2)
    {
        return new Complex(c1.Real * c2.Real - c1.Imaginary * c2.Imaginary, c1.Real * c2.Imaginary + c1.Imaginary * c2.Real);
    }

    public override string ToString()
    {
        return $"{Real} + {Imaginary}i";
    }
}

主代码：

Complex c1 = new Complex(1, 2);
Complex c2 = new Complex(3, 4);

Console.WriteLine($"c1 = {c1}");
Console.WriteLine($"c2 = {c2}");
Console.WriteLine($"c1 + c2 = {c1 + c2}");
Console.WriteLine($"c1 - c2 = {c1 - c2}");
Console.WriteLine($"c1 * c2 = {c1 * c2}");