Test your basic knowledge |

Objective C Programming Basics

Subjects : it-skills, apple
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






2. Data types are divided into two main categories: integer and ______






3. A programming unit that groups together a data structure (instance variables) and the operations (methods) that can use or affect that data; the principal building blocks of object-oriented programs.






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






5. Objective-C binds methods and arguments at _____ instead of compile time






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






7. A way to package a logically related set of classes & protocols and functions together with localized strings & online documentation and other pertinent files.






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






9. Rather than using arrays in Objective-C we often are able to use it's collection classes of NSArray - NSSet and NSDictionary with _____ for strings






10. In the Objective-C language the declaration of a group of methods not associated with any particular class.






11. Property attribute that synthesizes accessors that are not thread safe






12. All objects are created on the _____






13. An advanced object-oriented development platform in Mac OS X; a set of frameworks whose primary programming interfaces are in Objective-C.






14. To destroy an object set the variable that points to it to _____






15. Property attribute that causes the setter to store a strong reference to the assigned value






16. An object in another application - one that's a potential receiver for a remote message.






17. The time after a program is launched and while it's running. Decisions made at during this time can be influenced by choices the user makes.






18. Property attribute that causes the setter to store a zeroing weak reference to the assigned value






19. In Objective-C floats are more commonly used than ______






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






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






22. Data (like nouns) represent the information we are processing and in Objective-C this made up of the four elements of C types - _____ - enums and objects






23. A message sent from one application to an object in another application.






24. The general type for any kind of object regardless of class; defined as a pointer to an object data structure; can be used for both class objects and instances of a class.






25. 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.






26. Property attribute where the setter stores the assigned value but does not perform any memory management.






27. The process of setting or reading the value at an address pointed to by a pointer






28. 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.






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






30. There are ____ fundamental building blocks in Objective-C






31. Same as class object. (second way to say it.)






32. C-style strings always end with a ____ character






33. A class that's defined solely so that other classes can inherit from it. Programs don't use instances of this; they use only instances of its subclasses.






34. ____ provide a concise & elegant method for defining a discrete set of values






35. The name of a method when it's used in a source-code message to an object or the unique identifier that replaces the name when the source code is compiled.






36. Same as class object. (first way to say it.)






37. ARC is susceptible to retain _____






38. If you are compiling an application with ARC (Automatic reference Counting) you _______ store Objective-C objects inside a struct






39. 7 Common Integer data types: BOOL - char- short - int - long - _____ - NSInteger






40. 3 Common Float data types: float - _____ - CGFloat






41. In object-oriented programming - the method selector (name) and accompanying parameters that tell the receiving object in a message expression what to do.






42. _____ 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'.






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






44. An object id with a value of 0.






45. Any variable that's part of the internal data structure of an instance; declared in a class definition and become part of all objects that are members of or inherit from the class.






46. Property attribute that synthesizes both a getter and setter for the property






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






48. A method that can operate on class objects rather than instances of the class.






49. Each class should have a ______ initializer a single method responsible for performing all of the object's setup and initialization.






50. The Objective-C runtime table that contains entries that associate method selectors with the class-specific addresses of the methods they identify.