Object Oriented Programming using C++ Quiz Questions with Answers

1)      How to create a dynamic array of pointers(to integers) of size 10 using new in C++?

a)       Int *arr=new int *[10];

b)      Int **arr=new int **[10];

c)       Int **arr=new int [10];

d)      Not possible

Answer is b

2)      #include<iostream>

using namespace std;

class Base {

Public:

int fun()

{

cout<<”Base::fun() called”; }

int fun(int i) {

cout<<”Base::fun(int i) called”; }

};

class Derived: public Base {

public:

int fun() {

 cout<<”Derived::fun() called”; }

};

int main() {

Derived d;

d.Base::fun(5);

return 0;

}

a)       Compile error

b)      Base::fun(int i) called

Answer is B

We can access base class functions using scope resolution operator even if they are made hidden by a derived class function

3)      #include<iostream>

using namespace std;

class Base {};

class Derived: public Base {};

int main()

{

Base *bp=new Derived;

Derived *dp=new Base;

}

a)       No compile error

b)      Compile error

c)       Runtime error

Answer is  C

4)      Which of the following functions must use reference?

a)       Assignment operator function

b)      Copy constructor

c)       Destructor

d)      Parameterized constructor

Answer is  B

5)      Which of the following is FALSE about reference in C++

a)       References cannot be NULL

b)      A References must be initialized when declared

c)       Once a References is created ,it cannot be later made to References another object it cannot be reset

d)      References can’t refer to constant value

Answer is D