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. 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






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






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






4. _____ 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'.






5. The direct or indirect report of external activity especially user activity on the keyboard and mouse.






6. All objects are created on the _____






7. 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






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






9. Initializer method traditionally begin with the _____ prefix






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






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






12. 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).






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






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. The most flexible C data type: ______






16. 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.






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






18. 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.






19. Xcode sequence to examine an app for memory leaks or retain cycles






20. 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.






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






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






23. The 6 main categories of operators are: ____ - arithmetic - comparison - logical - bitwise and membership






24. 3 Common Float data types: float - _____ - CGFloat






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






26. The root class in Objective-C






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






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






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






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






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






32. 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.






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






34. 7 Common Integer data types: BOOL - char- short - int - long - _____ - NSInteger






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






36. The _____ function can be used to print a message to the console






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






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






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






40. _____ data types can be both positive and negative






41. A compiler feature that provides automated memory management






42. 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.






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






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






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






46. 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






47. 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.






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






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






50. 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.