It's 2 very simple iPhone (Android as well, it would be nice) apps based on this logic :
Ask to the user of the app to enter two parameter (2 numbers).
Adding them to each other it gives a result.
If the result if even, then show picture A. If the result is odd, then show Picture B.
That's it. That is the mechanism.
Now, I you to code a second app where we inverse the logic... so we ask the user to start by the end (choose a picture) and the app will tell him which parameters (those 2 numebrs) he has to get.
## Deliverables
Everything is included in the .zip archive where 2 four-slide pdf files explain everything.