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. An architecture that facilitates communication between objects in different address spaces.






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






4. ______ data types are always zero or greate






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






6. ARC is susceptible to retain _____






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






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






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






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






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






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






13. 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.






14. 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).






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






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






17. 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






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






19. 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.






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






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






22. 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.






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






24. 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.






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






26. An object of unknown class. Interface is published through protocol declaration.






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






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






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






30. 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.






31. 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).






32. a+b; is an example of using a _____ operator






33. 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.






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






35. In a format string the place holder for an object is ______






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






37. 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.






38. 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.






39. A class that's one step above another class in the inheritance hierarchy; the class through which a subclass inherits methods and instance variables.






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






41. The root class in Objective-C






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






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






44. 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






45. 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.






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






47. All objects are created on the _____






48. Objective-C objects should use strong or weak ______






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






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