Adding delegates

In the first stage, you have to add delegates. While you could put these into a separate file, for our purposes let's just place them here. So, enter the following above the line beginning with public partial class...:

public delegate bool Compare(double x, double y);

Remember, delegates are function or method wrappers, actually. Then, directly below this line, enter the following:

public delegate double Multiply(double x, double y);

You can see here that we have two delegates. One returns a Boolean data type, and the other one returns a double data type.