Essential things to remember from today's class (class 6, 7th September)

How to define << and >> functions for ostreams and istreams.

Why they can't be methods of your class.

What matrices are and why they are important in computing.
   You do not need to know how to do martix and vector multiplications for this
   class, but you will have to for a future required mathematics class.

What makes C++'s built-in implementation of multi-dimensional arrays almost useless.

How to create multi-dimensional arrays for yourself, safely and efficiently.