The ComplexNumber structure is fairly long, so I'll describe it in pieces.
You could make ComplexNumber either a class or a structure. Many programmers use classes exclusively. This isn't a terrible choice, in part because it frees you from having to deal with the differences between classes and structures.
I’ve decided to make ComplexNumber a structure for a couple of reasons. Microsoft's guidelines generally recommend using a structure if the item meets the following criteria:
- It is relatively small
- It logically represents a primitive type such as a number
- It is immutable, so its value does not change after it has been created
- It will not need to be boxed and unboxed often
