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Constructors and Destructors Interview Questions

MCQ Question 1 of 10

Question 1: C++ OOPS - Constructor Naming

What is the correct naming rule for a constructor in C++?

It must have the same name as the class and return type `int`It must have the same name as the class and no return typeIt must have a different name than the classIt must always return `void`

Question 2: C++ OOPS - Default Constructor

Which of the following correctly defines a default constructor?

Car() {}Car(int x) {}void Car() {}~Car() {}

Question 3: C++ OOPS - Parameterized Constructor

If `class Box` has a constructor `Box(int h, int w)`, how do we correctly create an object?

Box b = Box(h, w);Box b(h, w);Box b; b.Box(h, w);new Box(h, w);

Question 4: C++ OOPS - Constructor Overloading

What does constructor overloading in C++ mean?

Having multiple constructors with the same parametersHaving multiple constructors with different parameter listsDefining a constructor inside another constructorConstructors returning values

Question 5: C++ OOPS - Copy Constructor

Which of the following correctly declares a copy constructor for class `Student`?

Student(Student obj)Student(Student &obj)Student(const Student &obj)Student(Student *obj)

Question 6: C++ OOPS - Implicit Copy Constructor

When does the compiler provide a default copy constructor?

Always, even if one is defined by the userOnly when the class has no membersIf the user does not explicitly define oneNever

Question 7: C++ OOPS - Destructor Characteristics

Which of the following is true about destructors in C++?

They can be overloadedThey can take parametersThey do not have a return typeThey must be explicitly called

Question 8: C++ OOPS - Destructor Naming

Which is the correct way to define a destructor for class `Car`?

~Car() {}Car~() {}Destructor Car() {}delete Car() {}

Question 9: C++ OOPS - Order of Execution

What is the order of execution for constructors and destructors in nested objects?

Constructors and destructors both execute in the same order of declarationConstructors execute in declaration order, destructors in reverse orderBoth constructors and destructors execute in reverse orderRandom order decided by compiler

Question 10: C++ OOPS - Destructor Call

When is a destructor called for an automatic (stack) object?

Immediately after constructor callWhen object goes out of scopeOnly if `delete` is usedAt program start