**Code difficulty: *** 4/10*

**Math difficulty: *** 4/10*

Before we begin here: Q. What is a dual prime?

A. A dual prime is 2 prime numbers that are exactly “2” apart. Example: 3, 5 // 11,13, etc.

In his challenge I ask that you do the following things:

Create a program that will:

- Allow a user to input a number to iterate up to
- Allow the user to see all the dual primes, and a list of the numbers that are NOT dual prime
- Use either a vector or a list and their inherent member functions to handle the data from the loop

**Concepts used:*** Functions, variables, loops, arithmatic functions, breaks, boolean, vectors (or lists), template class member functions*

**You should be able to do this by:*** Lesson 44*

**My solution:** http://ideone.com/Y7wiJ (spoilers- Don’t look unless you are really stuck!)

*Please note that my solutions are not checked thoroughly, and should only be used for reference. They are often non-optimal solutions that could be improved upon (by you!). I keep these intentionally rough for just that reason.*