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






2. 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.






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






4. 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






5. In object-oriented programming the object that is sent a message.






6. This symbol denotes a method as being a class method






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






8. The part of an Objective-C class specification that defines public methods (those declared in the class's interface) as well as private methods (those not declared in the class's interface).






9. Consider: [NSString alloc]. 'alloc' is an example of a(n) class method rather than a _______ method






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






11. Objective-C methods are called using ____ _____






12. An object id with a value of 0.






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






14. A logical subdivision of a program within which all names must be unique. Symbols in one do not conflict with identically named symbols in another.






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






16. 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.






17. Short for mutual exclusion semaphore. An object used to synchronize thread execution.






18. Three main categories of more complicated data structures:_______ - arrays and structs






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






20. In C all functions pass their arguments by ____ which means the compiler makes local copies of those arguments






21. ARC is susceptible to retain _____






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






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






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






25. A compiler feature that provides automated memory management






26. 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.






27. Any method that can be used by an instance of a class rather than by the class object.






28. Square bracket syntax for calling a method






29. In object-oriented programming the ability of a superclass to pass its characteristics (methods and instance variables) on to its subclasses.






30. Property attribute that causes the setter to store a copy of the assigned value






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






32. A protocol that's declared with the @protocol directive. Classes can adopt these - objects can respond at runtime when asked if they conform to them and instances can be typed by those that they conform to.






33. 7 Common Integer data types: BOOL - char- short - int - long - _____ - NSInteger






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






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






36. A Cocoa framework that implements an application's user interface; provides a basic program structure for applications that draw on the screen and respond to events.






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






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






39. 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.






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






41. 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.






42. 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.






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






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






45. Objective-C is a _____ of the C language






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






47. 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.






48. A memory-management technique in which each entity that claims ownership of an object increments the object's reference count and later decrements it; allows one instance of an object to be safely shared among several other objects.






49. A variable that points to the memory address of another value






50. In object-oriented programming the hierarchy of classes that's defined by the arrangement of superclasses and subclasses. Every class (except root classes such as NSObject) has a superclass and any class may have an unlimited number of subclasses.