iPad Support

[robhasacamera]

Make your Calculator work on the iPad too (in the same application, i.e., a Universal application) by having two storyboards, one for the iPhone (described above) and one for the iPad that uses a UISplitViewController to present your old Calculator MVC on the left of the screen (or in a popover) and your new graphing MVC on the right.

Since both MVCs will be on the screen at the same time, you will not need a segue; instead, you will have to get a pointer to the other MVC using UISplitViewController API. You should only update the right side of the split view when the Graph button is pressed (not continuously as the brain is modified).