I had a problem which was going to drive me insane. The app on the simulator worked fine, but not on the device. I introduced depth in the prototype I'm working on, where buttons need to rotate and look 3d-ish. So when I added the z value, initially this was going to be zero. So I assumed that when I'm creating a variable it was going to be zero by default. I was wrong. It is only zero by default on the simulator. On the device it won't be, at least for floats. The result was a psychedelic trippy 3d-effect, which were ugly to say the least.
Now I know why Java pesters the programmer to not allow him to use variables which have not been initialized.
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