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

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Which keyword is used to create a copy constructor in C++?

A) copy B) constructor C) copy_constructor D) None of the above

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Answer & Solution

Answer: Option C

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What is the purpose of using constructor initialization lists in C++?

A) To override the default constructor B) To create multiple constructors for a class C) To initialize class members before the body of the constructor executes D) To define constructors with multiple arguments

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Answer & Solution

Answer: Option C

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What is the destructor called automatically when an object is destroyed in C++?

A) .~className() B) className::~() C) ~() D) ~className()

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Answer & Solution

Answer: Option D

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Which keyword is used to prevent an object from being copied in C++?

A) nocopy B) prevent_copy C) delete D) new

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Answer & Solution

Answer: Option C

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What happens if a destructor is made private in a C++ class?

A) It is a syntax error B) The destructor will still be called when needed C) It prevents object destruction D) The compiler will throw an error

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Answer & Solution

Answer: Option D

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In C++, which type of constructor is called when an object is created without any arguments?

A) Default constructor B) Parameterized constructor C) Copy constructor D) Destructor

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Answer & Solution

Answer: Option A

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What is the primary purpose of the explicit keyword in a C++ constructor?

A) To mark the constructor as static B) To specify the return type of the constructor C) To allow implicit type conversions D) To prevent implicit type conversions

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Answer & Solution

Answer: Option D

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In C++, what is the order of constructor and destructor calls for a class hierarchy?

A) Constructors: Derived to Base, Destructors: Base to Derived B) Constructors and Destructors follow the same order C) Constructors: Base to Derived, Destructors: Derived to Base D) Constructors: Derived to Base, Destructors: Derived to Base

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Answer & Solution

Answer: Option C

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What happens if a constructor throws an exception in C++?

A) The destructor is called to deallocate resources B) The object is not fully constructed C) The object is still constructed but may have undefined behavior D) None of the above

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Answer & Solution

Answer: Option B

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In C++, which function cannot be inherited but can be overridden in a derived class?

A) Default Constructor B) Parameterized Constructor C) Destructor D) Copy Constructor

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Answer & Solution

Answer: Option C

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