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9 Multiple choice questions

  1. Note
  2. parent class
  3. Note
  4. child class
  5. Instance variables that are accessed directly by a subclass must be declared in the interface section, and not in the implementation section. Instance variables declared or synthesized in the implementation section are PRIVATE instance variables and are not directly accessible by subclasses.
  6. Note
  7. First, the class to which the object belongs is checked. Then the parent class, and then the next parent class, and so on. If you don't find the method a warning message is generated.
  8. grandchild
  9. Fraction: NSObject

    Fraction is the child or subclass.