MCQ on Destructor in C++: Multiple Choice Questions on C++ Destructor

MCQ on destructor in C++ with answers and explanations for placement tests and job interviews. This C++ MCQ on destructor is useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our C++ destructor quiz (C++ destructor multiple Choice Questions ) focuses on all areas of the C++ destructor and its concept. We will regularly update the MCQ on the C++ destructor and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

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Guideline of MCQ on destructor in C++:

This MCQ on destructor in C++ is intended for checking your knowledge of C++ destructors. It takes 30 minutes to pass the C++ quiz on the destructor. If you don’t finish the C++ destructor quiz within the mentioned time, all the unanswered questions will count as wrong. Every unanswered question will count as wrong. MCQ on destructor in C++ has randomization features that give you a new question set at every attempt.

In this MCQ on destructor in C++, we have also implemented a feature that does not allows the user to see the next question or finish the quiz without attempting the current C++ destructor quiz.

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MCQ on Destructors in C++

MCQ on Destructors in C++: Multiple Choice Questions and Answers on Destructors in C++

1 / 14

Can I overload the destructor for my class?

Yes

2 / 14

What’s the order that local objects are destructed?

int main()
{
    Test obj1;
    
    Test obj2;
    
    return 0;
}

In same order of construction: First constructed, First destructed.

In reverse order of construction: First constructed, last destructed.

randomly

None of these

3 / 14

Predict the output of following C++ progran

#include <iostream>
using namespace std;
  
int i;
  
class A
{
public:
    ~A()
    {
        i=10;
    }
};
  
int foo()
{
    i=3;
    A ob;
    return i;
}
  
int main()
{
    cout << foo() << endl;
    return 0;
}

None of the above

4 / 14

What’s the order that sub-objects of an object are destructed?

struct Base0
{
    ~Base0() {};
};
struct Base1
{
    ~Base1() {};
};
struct Member0
{
    ~Member0() {};
};
struct Member1
{
    ~Member1() {};
};
struct Local0
{
    ~Local0()
    {

    };
};
struct Local1
{
    ~Local1()
    {

    };
};
struct Derived: Base0, Base1
{
    Member0 m0_;
    Member1 m1_;
    ~Derived()
    {
        Local0 l0;
        Local1 l1;
    }
};


int main()
{
    Derived d;

    return 0;
}

The order for destructor calls when d goes out of scope will be ~member0(), ~member1(), ~local0(), ~local1(), ~base0(), ~base1():

The order for destructor calls when d goes out of scope will be ~local0(), ~local1(), ~member0(), ~member1(), ~base0(), ~base1():

The order for destructor calls when d goes out of scope will be ~local1(), ~local0(), ~member1(), ~member0(), ~base1(), ~base0():

none of these

5 / 14

What’s the order that objects in an array are destructed?

int main()
{
    Test obj[5]; //array of Test class object
        
    return 0;
}

obj[4], obj[3], obj[2], obj[1], obj[0]

obj[0], obj[1], obj[2], obj[3], obj[4]

Randomly

obj[4], obj[0], obj[3], obj[2], obj[0]

6 / 14

Like constructors, can there be more than one destructors in a class?

Yes

7 / 14

#include <iostream>
using namespace std; 
class A
{
    int id;
    static int count;
public:
    A() {
        count++;
        id = count;
        cout << "constructor for id " << id << endl;
    }
    ~A() {
        cout << "destructor for id " << id << endl;
    }
};
  
int A::count = 0;
  
int main() {
    A a[3];
    return 0;
}

1.

constructor for id 1
constructor for id 2
constructor for id 3
destructor for id 3
destructor for id 2
destructor for id 1

2.

constructor for id 1
constructor for id 2
constructor for id 3
destructor for id 1
destructor for id 2
destructor for id 3

3.

Compiler Dependent.

4.

constructor for id 1
destructor for id 1

8 / 14

Could we destroy local objects within the function?

Yes we can

No we can not destroy it.

Not sure

Simply wrap the extent of the lifetime of the local in an artificial block {...}:

void MyCode()
{
  {
    Test f;
    // ...code that should execute when f is still open...
  }
  ↑ // f's destructor will automatically be called here!
  // ...code that should execute after f is closed...
}

Simply wrap the extent of the lifetime of the local in an artificial block {...}:

void MyCode()
{
  {
    Test f;
    // ...code that should execute when f is still open...
  }
  ↑ // f's destructor will automatically be called here!
  // ...code that should execute after f is closed...
}

9 / 14

When I write a derived class’s destructor, do I need to explicitly call the destructor for my base class?

Yes

It depend on implementation

Can't say

10 / 14

Which of the following statements are not true about destructor?

1. It is invoked when the object goes out of the scope
2. Like a constructor, it can also have parameters
3. It can be virtual
4. It bears the same name as that of the class and precedes the Lambda sign.

1, 2

2, 3

2, 4

2, 3, 4

11 / 14

Can I kill a local object by calling the destructor before going it out of the scope (Before the close } )

Yes

12 / 14

Can destuctors be private in C++?

Yes

13 / 14

Can destructors be virtual in C++?

Yes

14 / 14

Should I explicitly call a destructor on a local variable?

Yes

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MCQ on Destructor in C++: Multiple Choice Questions on C++ Destructor

Guideline of MCQ on destructor in C++:

You have 20 minutes to take the MCQs on Destructor in C++

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1.

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4.

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