data.brightness = 789; Alternatively, the struct can be initialized directly while declaring it. C offers two different ways to do so: pretending it was an array or using designated initializers.

Once again, pointers are simply memory addresses, and to fully utilize this similarity, C provides the concept of function pointers.

Mastering the C programming language - a classic code environment used to build software, apps, and whole operating systems - is a great skill, and Mac OS X makes it easy to learn.