What will be the output of the following code?

NSRect rect = NSMakeRect(0, 0, 10, 10);
NSRect *rect2 = malloc(sizeof(*rect2));
if(!rect2) {
    NSLog(@"Not enough memory.");
    exit(EXIT_FAILURE);
}

*rect2 = rect;

printf("%d\n", rect.size.width);

If you call interpretKeyEvents:, which of the following method is likely to be called?

Is the following code correct? NSRect a = NSMakeRect(0, 1, 2, 3) + NSMakeRect(0, 1, 2, 3);

Is the following code correct? NSMutableArray *a = [NSMutableArray array]; // do something with a [a release];

Is the following code correct? NSMutableArray *a = [[NSMutableArray new] autorelease]; // do something with a [a release];

Is the following code correct? NSMutableArray *a = [NSMutableArray new]; // do something with a [a release];

Which statement is correct:

Which is the correct statement:

______ is the root class for most classes in the Objective-C class hierarchy.

_______ is Cocoa's integrated development environment (IDE).

What is protocol?