iPhone Application Development - Stanford Program

NSLog: make sure you use NSString and not C strings.

NSLog(@"Name: %@", @"Nando Vieira"@); // this works
NSLog(@"Name: %@", "Nando Vieira"); // this crashes

Arrays need to end with nil; you can't have nil values except but the last item.

NSArray * letters = [NSArray arrayWithObjects: @"A", @"B", @"C", nil];