Test
ch12
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Preguntas del test (19)
1Select the false statement regarding inheritance.
- ASome derived classes can have multiple base classes.
- BBase classes are usually more specific than derived classes.
- CA derived class can be the base class for other derived classes.
- DA derived class can contain more attributes and behaviors than its base class.
2Which of the following is not a kind of inheritance in C++?
- Aprotected.
- Bstatic.
- Cprivate.
- Dpublic.
3The is-a relationship represents.
- AInformation Hiding.
- BA friend.
- CComposition.
- DInheritance.
4 Which of the following is most likely a base class of the other three?
- Aautomobile.
- BminiVan.
- Cconvertible.
- Dsedan.
5Which of the following is not a good example of a hierarchy that could be modeled by inheritance?
- AAirplanes.
- BGeometric shapes.
- CPrime numbers.
- DAnimals.
6To declare class subClass a privately derived class of superClass one would write:
- Aclass subclass : private superClass.
- Bclass subclass < private superClass >.
- Cclass subclass inherits private superClass.
- Dclass subclass :: private superClass.
7From most restrictive to least restrictive, the access modifiers are:
- Aprotected, public, private.
- Bprotected, private, public
- Cprivate, public, protected.
- Dprivate, protected, public.
8Protected base class members cannot be accessed by:
- Afriends of derived classes.
- BFunctions that are not derived-class member functions.
- CFunctions that are neither friends of the base class, derived-class member functions nor friends of a derived class
- Dfriends of the base class.
9Assuming the definition,
class Circle : public Point
which of the following is false?- AThe keyword public indicates the type of inheritance.
- BAll the public and protected members of class Circle are inherited as public and protected members, respectively, into class Point.
- CThe colon ( : ) in the header of the class definition indicates inheritance.
- DPoint is the base class and Circle is the derived class.
10Assuming the following is the beginning of the constructor definition for class Circle which inherits from class Point,
Circle::Circle( double r, int a, int b )
: Point( a, b )
The second line:- AInvokes the Point constructor with values a and b.
- BIs unnecessary because the Point constructor is called automatically.
- CCauses a compiler error.
- DIndicates inheritance.
11Which of the following is not one of the disadvantages of using the “copy-and-paste” approach to duplicating code from one class into another class?
- AErrors are prone to getting spread around.
- BAll of the above are disadvantages of the “copy-and-paste” approach.
- CIt is time consuming.
- DIt forces the system to store many physical copies of the code, creating a code-maintenance nightmare.
12When should base class members be declared protected?
- AThe protected access specified should never be used.
- BWhen these members should be available only to derived classes (and friends), not to other clients.
- CWhen all clients should be able to access these members.
- DWhen these members are only used by member functions of this base class.
13When an object of a derived class is instantiated, the __________ constructor initializes the _________ members.
- ABase class, derived class.
- BBase class, base class.
- CDerived class, base class.
- DDerived class, public.
14Base class constructors and assignment operators:
- ACan be inherited by derived classes, but generally are not.
- BAre not inherited by derived classes.
- CShould not be called by derived class constructors and assignment operators.
- DCan call derived-class constructors and assignment operators.
15Suppose class A inherits from base class B. What is the order in which their constructors and destructors will be called when an object of class A is instantiated and then destroyed?
- AB constructor, A constructor, A destructor, B destructor.
- BA constructor, B constructor, A destructor, B destructor.
- CB constructor, A constructor, B destructor, A destructor.
- DA constructor, B constructor, B destructor, A destructor.
16Which forms of inheritance are is-a relationships?
- AOnly public and private.
- BOnly public.
- CAll forms of inheritance are is-a relationships.
- DOnly public and protected.
17When deriving a class from a protected base class, the public members of the base class become _________ and the protected members of the base class become __________?
- Apublic, private
- Bpublic, protected.
- Cprotected, private
- Dprotected, protected.
18Theoretically, clients do not need to see the _________ of classes from which they derive other classes.
- AInterface.
- BHeader files.
- CSource code.
- DObject code.
19Which of the following is true about using inheritance in software engineering?
- AA class produced through inheritance should be as large as possible to fully encompass all of the functionality it should offer.
- BCommon attributes and behaviors should be factored out of closely related classes and placed into a base class from which the original classes can now inherit.
- CThe standard C++ libraries that are shipped with C++ compilers are usually enough to accomplish anything an application might need to do.
- DIt is best to create a huge class library to make it easy for a client to find the most appropriate class for his or her needs.
Información
- Descripción
- Test sobre ch12, creado por mnahvi7+examtime el 14/04/2016.
- Autor
- mnahvi7+examtime
- Idioma
- English
- Visitas
- 2
- Valoración
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