chapter15_6e

1、Test Bank for Problem Solving with C+: The Object of Programming, 6/e Chapter 15 InheritanceTRUE/FALSE 1. If you use the keyword virtual in a function declaration, you must also use it in the function definition.ANSWER: FALSE2. Destructors are not inherited into the derived class.ANSWER: TRUE3. The

2、assignment operator is inherited from the base class.ANSWER: FALSE4. The copy constructor from the base class is not inherited into the derived class.ANSWER: TRUE5. All member functions in a base class should be listed as virtual functions.ANSWER: FALSE6. An object of a derived class can be stored i

3、n a base class variableANSWER: TRUE7. The derived class may define variables and member functions other than those that are in the base class.ANSWER: TRUE8. The base class has everything that is in the derived class and moreANSWER: FALSE9. The constructor for a class is inherited.ANSWER: FALSE10. A

4、derived class automatically gets all the member variables from the base class.ANSWER: TRUESHORT ANSWER 1. When we derive one class from another class, this is known as _ANSWER: inheritance2. Which is more general, the base class or the derive class.ANSWER: base class3. The ifstream class is derived

5、from the _ class.ANSWER: istream4. When the derived class gets all the member variables from the base class, we say that they are _ from the base class.ANSWER: inherited5. A constructor of the base class is _ inherited in the derived class (is/is not)ANSWER: is not6. If the member variables in a bas

6、e class are marked as private, can a derived class directly access those variables?ANSWER: No7. If the member variables of the base class are marked as protected, who can access those variables?ANSWER: members, friends, and classes derived from that base class8. Member functions defined as private i

7、n the base class (are/are not) inherited in the derived classANSWER: are not9. If two functions (in the same scope) have the same name, but a different function signature, this means that the functions are _.ANSWER: overloaded10. The ability to associate multiple meanings to one function name using

8、dynamic binding is called _.ANSWER: polymorphism.11. C+ implements polymorphism by waiting until run-time to determine which version of a function to use. This is also known as _.ANSWER: late or dynamic binding12. If a base class has declared a function to be a virtual function, then does the derive

9、d class need to include the word virtual also?ANSWER: No13. A base class pointer variable can point toANSWER: base class and derived class objects14. A derived class pointer can point to ANSWER: derived class objects.15. Using virtual functions is also known as _ the functionsANSWER: overridingMULTI

10、PLE CHOICE1. What is another name for a child class?a. derived classb. sub classc. descendent classd. all of the abovee. none of the aboveANSWER :D2. A base class may have at most _ child class derived from it.a. 1b. 2c. 12d. any number ANSWER :D3. Which is the correct way to tell the compiler that

11、the class being declared (ChildClass) is derived from the base class (BaseClass)?a. class ChildClass:public BaseClassb. class ChildClass:public BaseClassc. class ChildClass childOf public BaseClassd. class ChildClass derived BaseClassANSWER :B4. Another name for the base class isa. parent classb. su

12、per classc. ancestor classd. all of the abovee. none of the aboveANSWER :D5. If you define a function in the derived class that has the same function signature as a function in the base class, this is known asa. overloadingb. redefinitionc. overwritingd. a syntax errorANSWER :B6. If the member varia

13、bles in a base class are private, thena. they can be directly accessed or changed in the derived classb. the derived class must use any accesssor or modifier functions from the base classc. making them private causes a syntax error.d. you must declare them in the derived class also.ANSWER :B7. In th

14、e derived class definition, you list from the base classa. all the member functions every timeb. only those member functions that need to be redefinedc. only those member functions that were in the public sectiond. only those member functions you want to overload.ANSWER :B8. Give a base class with a

15、t least one public member function, how many classes can redefine that member function?a. 1b. 0c. all of themd. none of the aboveANSWER :C9. If a base class has a public member function, and the derived class has a member function with the same name, but with a different parameter list, this functio

16、n is said to bea. overloadedb. redefinedc. overwrittend. a syntax errorANSWER :A10. Using inheritance allows us toa. eliminate duplicate codeb. make our classes more modularc. use polymorphismd. all of the abovee. none of the aboveANSWER :D11. Which of the following are not truea. an object of the d

17、erived class may be stored in a variable of the base classb. an object of the base class may be stored in a variable of the derived classc. an object of a derived class that is derived from another class that is derived from a third class can be stored in a variable of the third class.d. all of the

18、abovee. none of the aboveANSWER :B12. Which of the following are true?a. constructors of the base class are inherited in the derived class.b. you may not call the base constructor from the derived classc. You must define constructors in both the base and derived classesd. all of the abovee. none of

19、the aboveANSWER :E13. If you have the following class definitions, which of the following is the proper way to construct an object of the derived class?class Petpublic: Pet(); void printPet(); string getName(); void setName(string newName);private: string name;class Dog:public Petpublic: Dog(); void

20、 printPet(); void setType(string newType); string getType();private: string type;a. Dog:Dog():Pet(),type("MUTT")b. Dog:Dog()name="Rover"c. Pet:Dog():Pet(),type("MUTT")d. Dog:Pet():Pet(),type("MUTT")ANSWER :A14. If the member variables in the base class are lis

21、ted as protected, then who can access or modify those variables?a. friends of the base classb. friends of the derived classc. members of the base classd. members of the derived classe. A and Bf. C and Dg. All of the aboveANSWER :G15. If a base class has public member functions that are not listed by

22、 a derived class, then these functionsa. are not available to the derived classb. are inherited unchanged in the derived classc. are private to the derived classd. do not exist in the derived classANSWER :B16. When deriving a class, you shoulda. list only base class functions that will be redefinedb

23、. list all the member functions of the base classc. make every function a virtual functiond. overload all the base class member functionsANSWER :A17. If a derived class (Class2) has redefined a function from the base class (Class 1), how can that derived function call the base class function if the

24、function declaration is as follows?void print( );a. :public Class1:print( );b. Class1 : print( );c. print( );d. all of the above.ANSWER :B18. If you have a copy constructor in the base class, but do not have a copy constructor for the derived class, thena. you will have a syntax errorb. a copy const

25、ructor for the derived class is automatically created for youc. you can not use pointer variablesd. the default constructor is usedANSWER :B19. Which of the following would correctly call the base class (BaseClass) assignment operator from the derived class (DerivedClass) assignment operator?Derived

26、Class& DerivedClass:operator =(const DerivedClass& rightSide)/what goes here?a. BaseClass:operator=(rightSide);b. leftSide=rightSide;c. rightSide=BaseClass.rightSide;d. DerivedClass:rightSide=BaseClass:rightSide;ANSWER :A20. Given a class A that derives from a class B that derives from a cla

27、ss C, when an object of class A goes out of scope, in which order are the destructors called?a. C, B, then Ab. A, B, then Cc. unable to determined. depends on how the code is written for the destructorsANSWER :A21. Polymorphism refers toa. the ability to assign multiple meanings to one function name

28、.b. overriding base class functions.c. overloading functionsd. none of the aboveANSWER :A22. In order to tell the compiler to wait to decide which version of a function to use, you must precede the function declaration in the base class with the keyword a. operatorb. friendc. virtuald. voidANSWER :C

29、23. If the following function is in a base class, which of the following are polymorphic declarations of the same function in the derived class?virtual void print( ostream& out);a. virtual void print ( ostream& out);b. void print( ostream& out);c. void print();d. virtual void print();e.

30、A and Bf. A and DANSWER :E24. Given the following simplified classes, class Petpublic: virtual void print(); string name;private:;class Dog: public Petpublic: void print(); string breed;Dog vDog;Pet vPet;vD="rover" vDog.breed = "Collie"Which of the following statements are

31、 not legal?a. vPet=vDog; cout << vD;b. vPet=vDog; cout << vDog.breed;c. vPet=vDog; cout << vP;d. vPet=vDog; cout << vPet.breed;ANSWER :D25. Given the following classes and code, what is the output of the last statement shown?class Petpublic: virtual void print()

32、; string name;private:;class Dog: public Petpublic: void print(); string breed;void Pet:print() cout << "My name is " << name;void Dog:print() Pet:print(); cout << ", and my breed is a "<< breed << endl;Pet* pPtr;Dog* dPtr=new Dog;dPtr->name= &quo

33、t;Rover"dPtr->breed="Weiner"pPtr= dPtr;pPtr->print();a. My name is Rover, and my breed is a Weinerb. My name is Roverc. , and my breed is a Weinerd. nothingANSWER :A26. Given the following classes and code, what is the output of the last statement shown?class Petpublic: virtual

34、void print(); string name;private:;class Dog: public Petpublic: void print(); string breed;void Pet:print() cout << "My name is " << name;void Dog:print() Pet:print(); cout << ", and my breed is a "<< breed << endl;Pet pPtr;Dog dPtr;dPtr->name= "Rover"dPtr->breed="Weiner"pPtr= dPtr;pPtr->print();a. My name is Rover, and my breed is a Weinerb. My name is Ro