Apple Certification Exam 9L0-509

We added an extra level of scoping at the switch statement because this statement demands a left 9L0-509 brace, and it shows that even at that point a new level of scope is opened (because we were able to declare yet another variable called `i' without getting an error). As you can see, the various Apple 9L0-402 control structures (i.e. the while, if and switch statements) all end at their own matching right brace and hence at the same point as the scope ends. It is fair to say that each of these control statements operates over an area of scope. But remember, scope is a concept 9L0-509 about variable names and the area in which they are defined, not control structures.

It is not essential that either the if or the while statements have an opening brace following, and program average above shows an example of this with its while statement. In this situation, no new level of scope is begun. It is the left brace that opens the new 9L0-402 study guide level of scope, not the if or while statement itself. The switch statement demands a left brace at that point, but notice that the `i' switch variable is at the old level of scope. The new level of scope comes into existence immediately following the left brace as always.