C++ Destructors

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Question 1

Can destructors be private in C++?

  • Yes

  • No

Question 2

Predict the output of following C++ progran CPP 
#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;
}
  • 0
  • 3
  • 10
  • None of the above

Question 3

Like constructors, can there be more than one destructors in a class?
  • Yes
  • No

Question 4

CPP 
#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;
}

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

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

  • Compiler Dependent.

  • constructor for id 1
destructor for id 1

Question 5

Can destructors be virtual in C++?

  • Yes

  • No

Question 6

What will be the output?

C++ 
#include <iostream>
class Test {
public:
    ~Test() {
        std::cout << "Destructor called\n";
    }
};

int main() {
    Test t1;
}


  • No output

  • Destructor called

  • Compilation error

  • Runtime Error

Question 7

What will be the output?

C++ 
#include <iostream>
class Sample {
public:
    ~Sample() {
        std::cout << "Destructor executed\n";
    }
};

void createObject() {
    Sample s;
}

int main() {
    createObject();
    std::cout << "Main done\n";
}


  • Main done

  • Destructor executed

  • Destructor executed
    Main done

  • Main done
    Destructor executed

There are 7 questions to complete.

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