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“C++ Constructors frequently Asked Questions by expert members with experience in C++ constructors. These questions and answers will help you strengthen your technical skills, prepare for the new job test and quickly revise the concepts”

51 C++ Constructors Questions And Answers

21⟩ Which of the following statement is correct? A. A constructor of a derived class can access any public and protected member of the base class. B. Constructor cannot be inherited but the derived class can call them. C. A constructor of a derived class cannot access any public and protected member of the base class. D. Both A and B.

Option D

Both A and B.

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22⟩ Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort. A. are called B. are inherited C. are not called D. are created

Option C

are not called

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23⟩ A class's __________ is called when an object is destroyed. A. constructor B. destructor C. assignment function D. copy constructor

Option B

destructor

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24⟩ Which of the following statements are correct? A. Constructor is always called explicitly. B. Constructor is called either implicitly or explicitly, whereas destructor is always called implicitly. C. Destructor is always called explicitly. D. Constructor and destructor functions are not called at all as they are always inline.

Option B

Constructor is called either implicitly or explicitly, whereas destructor is always called implicitly.

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25⟩ For automatic objects, constructors and destructors are called each time the objects A. enter and leave scope B. inherit parent class C. are constructed D. are destroyed

Option A

enter and leave scope

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26⟩ Which of the following statement is correct? A. Constructor has the same name as that of the class. B. Destructor has the same name as that of the class with a tilde symbol at the beginning. C. Both A and B. D. Destructor has the same name as the first member function of the class.

Option C

Both A and B.

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27⟩ Which constructor function is designed to copy objects of the same class type? A. Create constructor B. Object constructor C. Dynamic constructor D. Copy constructor

Option D

Copy constructor

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28⟩ How many times a constructor is called in the life-time of an object? A. Only once B. Twice C. Thrice D. Depends on the way of creation of object

Option A

Only once

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29⟩ Which of the following statement is incorrect? A. Constructor is a member function of the class. B. The compiler always provides a zero argument constructor. C. It is necessary that a constructor in a class should always be public. D. Both B and C.

Option D

Both B and C.

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30⟩ Copy constructor must receive its arguments by __________ . A. either pass-by-value or pass-by-reference B. only pass-by-value C. only pass-by-reference D. only pass by address

Option C

only pass-by-reference

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31⟩ When are the Global objects destroyed? A. When the control comes out of the block in which they are being used. B. When the program terminates. C. When the control comes out of the function in which they are being used. D. As soon as local objects die.

Option B

When the program terminates.

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32⟩ Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class? A. Preprocessor B. Linker C. Loader D. Compiler

Option D

Compiler

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33⟩ Which of the following gets called when an object goes out of scope? A. constructor B. destructor C. main D. virtual function

Option B

destructor

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34⟩ Which of the following statement is correct? A. A constructor has the same name as the class in which it is present. B. A constructor has a different name than the class in which it is present. C. A constructor always returns an integer. D. A constructor cannot be overloaded.

Option A

A constructor has the same name as the class in which it is present.

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35⟩ Which of the following never requires any arguments? A. Member function B. Friend function C. Default constructor D. const function

Option C

Default constructor

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36⟩ Destructor calls are made in which order of the corresponding constructor calls? A. Reverse order B. Forward order C. Depends on how the object is constructed D. Depends on how many objects are constructed

Option A

Reverse order

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37⟩ A destructor takes __________ arguments. A. one B. two C. three D. no

Option D

no

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38⟩ It is a __________ error to pass arguments to a destructor. A. logical B. virtual C. syntax D. linker

Option C

syntax

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39⟩ If the programmer does not explicitly provide a destructor, then which of the following creates an empty destructor? A. Preprocessor B. Compiler C. Linker D. main() function

Option B

Compiler

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40⟩ __________ used to make a copy of one class object from another class object of the same class type. A. constructor B. copy constructor C. destructor D. default constructor

Option B

copy constructor

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