1) In order to protect a librarys interface file from being included multiple times, we always put in three special

preprocessor directives. Show a skeleton/template of what this looks like here.

What is the symbol/name being defined here? (I.E. What does it represent in this process of precluding multiple

header file inclusion? How do you come up with it is there a simple pattern we can follow? Make sure I know

what it is in the context of your sample above.)

2) Given that a class Complex exists, properly2 declare an array to hold as many as 50 Complex objects.

Now well assume your program has already read in a certain number of Complex values into this array. Further,

well assume that you need to take their average. BTW, it may help if you also knew that that this class has a

method to add two Complex objects. Its call signature is:

Complex Complex::add(const Complex & b) const;

It also has a method to divide a Complex object by a floating-point value. Its call signature is:

Complex Complex::divide(double n) const;

Show your code to average all the elements in your array of values. (Hint: what is the data type of the average of

two or more complex numbers?)