Objective-C Programming (2nd Edition)   4. if/else

About the 4. if/else category (1)
Challenge (17)
Expected Expression error: Can't figure out (3)
BOOL question! (2)
This is stupid but I am stuck! Please help (3)
BOOL confuses me (6)
For the more curious: conditional operators (3)
My Xcode do not have BOOL (2)
I'm having trouble with the challenge for this chapter (4)