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






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






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






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






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






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






8. 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.






9. Instance variables are optional in iOS if ________ are used






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






11. 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.






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






13. 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






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






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






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






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






18. 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.






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






20. In object-oriented programming a procedure that can be executed by an object.






21. A language such as C that organizes a program as a set of procedures that have definite beginnings and ends.






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






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






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






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






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






27. 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.






28. ______ data types are always zero or greate






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+b; is an example of using a _____ operator






31. ARC is susceptible to retain _____






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






33. 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.






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






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






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






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






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






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






40. 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.






41. 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.






42. 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.






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






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






45. This symbol denotes a method as being an instance method






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






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






48. 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.






49. In a home building analogy a ____ is the blueprint and the object is the house






50. In object-oriented programming the ability of different objects to respond each in its own way - to the same message.