C++ Destructors

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