Constructors and Destructors in C++ MCQ question and answer with solution

31

Which of the following statements about constructor initialization lists in C++ is correct?

A) They cannot be used in constructors with default arguments B) They can only be used in copy constructors C) They can only be used for primitive data types D) They must be used for initializing all members of a class

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Answer & Solution

Answer: Option D

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32

Which of the following statements is true about constructors in C++?

A) Constructors can have a return type B) Constructors cannot be overloaded C) Constructors can be called explicitly D) Constructors can be virtual

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Answer & Solution

Answer: Option B

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33

What is the purpose of using default arguments in C++ constructors?

A) To allow the constructor to be called without arguments B) To provide a default value for constructor arguments C) To specify the order of constructor execution D) To prevent the use of constructor arguments

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Answer & Solution

Answer: Option B

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34

Which statement about constructor inheritance in C++ is correct?

A) Constructors cannot be inherited B) Constructors are inherited with the same access specifier C) Constructors can only be inherited privately D) Constructors are inherited with different names

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Answer & Solution

Answer: Option B

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35

Which statement about destructors in C++ is true?

A) Destructors can be overloaded B) Destructors cannot have any arguments C) Destructors can have a return type D) Destructors can be called explicitly

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Answer & Solution

Answer: Option B

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36

Which operator is used to access members of an object in C++?

A) Dot operator (.) B) Arrow operator (->) C) Double colon (::) D) Star operator (*)

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Answer & Solution

Answer: Option A

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37

What is the access specifier that allows constructors to be called only from member functions of the same class and its derived classes in C++?

A) protected B) public C) private D) friend

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Answer & Solution

Answer: Option C

Solution:

In C++, the access specifier that allows constructors to be called only from member functions of the same class and its derived classes is private. When a constructor is declared as private, it cannot be accessed from outside the class, limiting its invocation to member functions of the same class and its derived classes.

Option A: protected allows access to member functions and data members from within the same class, derived classes, and friend classes, but it still allows derived classes to call constructors, which might not be desired in some cases.
Option B: public allows unrestricted access to the constructor from anywhere, defeating the purpose of restricting its usage to only member functions of the same class and its derived classes.
Option D: friend allows non-member functions or external classes to access private and protected members of a class, but it doesn't restrict the calling of constructors to member functions of the same class and its derived classes.

Therefore, the correct answer is Option C: private.

38

What happens if the destructor is explicitly defined in a C++ class, but the constructor is not defined?

A) It will cause a compilation error B) The class will be instantiated with default values C) The destructor will not be called D) The class will not be able to create objects

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Answer & Solution

Answer: Option C

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39

What is the purpose of using the delete keyword in C++ destructors?

A) To deallocate memory for dynamically allocated objects B) To call the parent class destructor C) To prevent the destructor from being called D) To explicitly call the destructor

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Answer & Solution

Answer: Option C

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40

Which of the following is correct?

A) Destructors can be virtual B) There can be more than one destructor in a class C) Destructor definition starts with ! D) Destructor is used to initialize objects

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Answer & Solution

Answer: Option A

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Constructors and Destructors in C++ MCQ question and answer with solution | C++ Programimg MCQs