Test your basic knowledge |

Objective C Programming Basics

Subjects : it-skills, apple
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The init... method that has primary responsibility for initializing new instances of a class. Each class defines or inherits its own. Through messages to self other init... methods in the same class directly or indirectly invoke it and then it - thro

2. An instance variable that points to another object; _____ instance variables are a way for an object to keep track of the other objects to which it may need to send messages.

3. 7 Common Integer data types: BOOL - char- short - int - long - _____ - NSInteger

4. In object-oriented programming an expression that sends a message to an object. In the Objective-C language they are enclosed within square brackets and consist of a receiver followed by a message (method selector and parameters).

5. _____ allow you to add new methods to existing classes

6. Xcode sequence to convert non-ARC apps to ARC

7. The root class in Objective-C

8. Giving the compiler information about what kind of object an instance is - by typing it as a pointer to a class.

9. Objective-C's protocols are really about communicating _____ _______

10. A tool that lets you graphically specify your application's user interface. It sets up the corresponding objects for you and makes it easy for you to establish connections between these objects and your own code where needed.

11. A remote message that returns immediately without waiting for the application that receives the message to respond. The sending application and the receiving application act independently and are therefore not in sync.

12. When creating a class implementation file you begin with the _____ keyword and close with the @end keyword

13. C-style strings are stored in an array of _____

14. Objective-C borrows much of its syntax from ______ one of the earliest object-oriented languages

15. A class is said to do this when it declares that it implements all the methods in the protocol.

16. A technique used in C-based languages where the operating system provides memory to a running application as it needs it instead of when it launches.

17. a++; is an example of using a _____ operator

18. A programming technique that hides the implementation of an operation from its users behind an abstract interface; allows the implementation to be updated or changed without impacting the users of the interface.

19. Pointers are declared by placing a(n) ___ between the type declaration and the variable name

20. Created by the compiler - lacks instance variables and can't be statically typed but otherwise behave like all other objects. As the receiver in a message expression - a it is represented by the class name.

21. Finding the method implementation to invoke in response to the message

22. In computer science the mathematical concept of 'order of operations' is known as the 'order of ______'

23. An object that acts on behalf of another object.

24. The most flexible C data type: ______

25. A ____ _____ is where you forget to free up memory

26. All objects are created on the _____

27. A remote message that doesn't return until the receiving application finishes responding to the message. Because the application that sends the message waits for an acknowledgment or return information from the receiving application - the two applica

28. Square bracket syntax for calling a method

29. A class is said to do this to a protocol if it (or a superclass) implements the methods declared in the protocol. An instance does this to a protocol if its class does. Thus an instance that does this to a protocol can perform any of the instance met

30. A _______ method is one that is likely to be unsupported in the future. It's use should be discontinued.

31. Procedures (like verbs) are processes that manipulate or transform data and in Objective-C these 3 elements are _____ - functions and methods

32. A struct may contain multiple ____ consisting of different data types

33. Zeroing weak referencing should be used for _____ and data sources to prevent inadvertent retain cycles

34. _____ allow indirect access and modification of a variable's value.

35. Any class that's one step below another class in the inheritance hierarchy.

36. The first index in an array is valued at ____

37. Another name for a class that's defined solely so that other classes can inherit from it.

38. The time when source code is compiled; constrained by the amount and kind of information encoded in source files.

39. Two additional foundational building blocks of Objective-C distinct from data and procedure type foundations: ________ and Categories/Extensions

40. Discovering the class of an object at runtime rather than at compile time.

41. Symbol used to denote a placeholder in a format string

42. A set of method definitions that is segregated from the rest of the class definition.

43. Initializer method traditionally begin with the _____ prefix

44. A prototype for a particular kind of object; declares instance variables and defines methods for all members of the class.

45. The time when files compiled from different source modules are linked into a single program. Decisions made by the linker are constrained by the compiled code and ultimately by the information contained in source code.

46. _____ is one of the main advantages of object-oriented code and allows objects to 'hide away' much of their complexity operating at times like a proverbial 'black-box'.

47. The part of an Objective-C class specification that declares its public interface which includes its superclass name & instances variables and public-method prototypes.

48. A protocol declared as a category usually as a category of the NSObject class.

49. ARC is susceptible to retain _____

50. In the Objective-C language an object that belongs to (is a member of) a particular class; created at runtime according to the specification in the class definition.