Hi…. im new to the whole app thing… well even computers the last computer i owned has win95. my grandfather installs locks for a living. I figured id try and help him out and make an app for his phone to better keep track of the things he needs to do. So here i am trying to figure this out. Well the problem is in a hotel there are various floor levels and different number doors… he needs counts of the locks he does not change, and the ones he does change need to be sorted in a orderly fashion. Each door has one of the possibilities of being a Left hand, Right hand, Left hand Reverse, Right Hand Reverse, L.H. Utility, R.H.Utility, L.H.Utility Reverse, or a R.H.U. Reverse. He would need to be able to not only count how many locks he has done for the building but for each floor. Also he would need counts for each type of lock installed. Also a button that could negate a room number ( seeing as though most hotels dont like to label anything with the number thirteen and some use what would be the 3rd or 23rd they make as an entrnce for a stairway) Can anyone please help?!?!?