Worksheet 5 Chapter 6

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Joan Cross
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1 Worksheet 5 Chapter 6 Transfer your answers to all questions to Chi-Tester. ONCE YOU START YOUR CHI- TESTER SESSION, YOU CANNOT CLOSE IT AND RESTART - TRANSFER ALL OF YOUR ANSWERS TO CHI-TESTER AT ONE TIME. The first 18 questions are from the textbook; question numbers from the text are given in square brackets at the beginning of the question on Chi-Tester. Please take a few moments to read the feedback. 1. [1] What is the purpose of a class declaration (note that the text says "definition")? a. To allocate memory to hold an instance of a class. b. To provide user documentation for the private sections of a class. c. A To describe how objects of a class will look when they are created. d. To serve as a place holder until a proper class definition can be written. 2. [2] A has the same relation to an that a basic data type has to a variable of that type. 3. [3] In a class definition, data or functions designated private are accessible a. to any function in the program. b. only if you know the password. c. to member functions of that class. d. only to public members of the class. 4. [5] Data items in a class must be private.. 5 [6] Write a statement that defines an object called lever1 of a class named leverage (do not include the semicolon at the end of the statement). 6. [7] The dot operator (or class member access operator) connects the following two entities (reading from left to right): a. A class member and a class object b. A class object and a class c. A class and a member of that class d. A class object and a member of that class 7. [8] Write a statement that executes the pry() function in the lever1 object (do not include the semicolon at the end of the statement). 8. [9] Member functions defined inside a class definition are by default.

2 9. [11] A constructor is executed automatically when an object is 10. [12] A constructor's name is a. the same as the class of which it is a member b. ctor c. unique d. always capitalized 11. [13] Which constructor, defined in the class, correctly initializes to 0 a class member named crowbar in a class named leverage? a. leverage() crowbar = 0; } b. leverage() : crowbar(0) } c. leverage() : crowbar(0); } d. leverage() crowbar = 0; 12. [14] In a class you can have more than one constructor with the same name. 13. In a class you can have more than one destructor with the same name. 14. [18]The only technical difference between structures and classes in C++ is a. features in classes are public by default while features in structures are private by default. b. features in classes are private by default while features in structures are public by default. c. classes may have functions while structures may not. d. there is no technical difference between classes and structures. 15. [19] If three objects of a class are defined, how many copies of that class's data items are stored in memory? How many copies of its member functions? 16. [20] Sending a message to an object is a. implemented by the Internet message protocol b. the same as calling one of its member functions c. the same as passing an object as a parameter to a function d. only possible if the correct system header file is #included in the program 17. [21] Classes are useful because they a. are removed from memory when not in use. b. permit data to be hidden from other classes. c. bring together all aspects of an entity in one place. d. can closely model object in the real world.

3 18. [22] There is a simple but precise methodology for dividing a real-world programming problem o classes. 19. Choose the best name for the function illustrated below. class foo foo(); // what is this function a. Copy constructor b. Default constructor c. Conversion constructor d. Compiler generated constructor

4 20. Choose the best C++ class named person that has: A private member field for the person s first name; A private member field for the person s last name; A private member field for the person s and a ppublic constructor a. public class person private private private public age(a) } } b. class person person( f, l, a) : first(f), last(l), person( f, l, a) : first(f), last(l), age(a) } c. class person person( f, l, a) : first(f), last(l), age(a) } d. class person person( f, l, a) : first(f), last(l), age(a) } e. class person person( f, l, a) : first(f), last(l), age(a) }

5 21. Choose the best C++ class that implements the above UML class diagram. (The word "in" is an artifact of Microsoft Visio, the tool used to draw the diagram, and may be ignored.) a. class Student private name; private double gpa; public Student( n, double g) : name(n), gpa(g) } b. class Student double name; gpa; Student( n, double g) : name(n), gpa(g) } c. class Student double name; gpa; Student( n, double g) : name(n), gpa(g) } d. class Student name ; gpa double; Student(n, g double) : name(n), gpa(g) }

Classes in C++98 and C++11

Classes in C++98 and C++11 January 10, 2018 Brian A. Malloy Slide 1 of 38 1. When we refer to C++98, we are referring to C++98 and C++03, since they differ only slightly. C++98 contained 3 types of constructors,