Info for my thesis

[thelect]

hello guys. I'm not a dev, but I need know some thinks for my thesis:
1. Can one develop only for one device (for example, only for 4s)?
2. If I want develop for more than 1 device, I need write more line of code?
3. There is a yearly fee to pay to apple? And how this is?
4. Which is the royalty that apple take for each sell?

TNX

[MadChef]

Best answer will probably be: iOS Developer Program - Apple Developer

[baja_yu]

1. I asume you mean one type. Technically no, but there are parameters you can set for hardware that your app requires. For example, stating that it requires SMS functionality will exclude iPod and iPad.
2. It depends on the functionality of the app and the earliest version of iOS you want to support. But usually, no, not a lot more.
3. Yes, $99 per year. See developer.apple.com
4. 30%