Views needed?

I have been posting about my program a lot but don't seem to be getting any responses but I think it's because I'm over complicating things.
I want to make a program that divides 2 values and displays them in a Label after a button is pressed. What views do I need to create this e.g. UIViewController or an App Delegate, or NSObject etc? Does it matter which view I use? I have already started to make this as you may have seen in my other posts but the calculation function crashes the program so I'm guessing I'm using the wrong View Controllers.
Thanks

Hmm, I don't know what is wrong then, because even when I use your code in a new project, the application either quits or it is just blank. I assume I only delete the .h, .m and the .xib dev111 files? It could be that I don't have the recent Xcode app. I will try downloading it as that may fix the problem?

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