Java&Sepples Challenge

Okay, here is the challenge.
The first one after me creates a very easy problem. The first person to post a working solution to that problem with either Java or C++ posts another problem but this time slightly more difficult then the previous and so on.

>>8
I would classify the calculator as more easy. But it is my personal opinion.
The thing is, this should get gradually more difficult with each challenge. Where the fun is 1) solve the problem 2)make a new, only slightly more difficult problem. But with so many trolls and idiots here, I better go to /code/.