Update CPPC.cpp V0.2

Version 0.2 updates:

- Added "using namespace std;" to remove the need of having "std::" in nearly every line.
- Added "cube number" function
- Added an extra "\n" to each problem at the end for readability.
- Added extra comments for easier and quicker understanding.

Closed unnecessary gap between two inputs. (In other words, I took out the \n after each input for readability.)

On the above note, I didn't remove the space between input and answer, but you may want to.

Fixed formatting issues on all problems where a number was entered under the problem rather than after it. (Now looks cleaner.)

Replaced irrelevant "endl"s with a smaller extra "\n" instead.

Updated on: 2/12/2014
Updated by: https://github.com/ArnoldM904