C-Plus-Plus Questions

1 / 15

1. What is Pseudo-random number engines?

A. Uses user input for random number generation

B. Uses an algorithm that does not require any initial seed to generate random numbers

C. Uses initial seed based algorithm to generate random numbers

D. Random number generates depends on the program

2 / 15

2. What will be the output of the following C++ code?

#include
using namespace std;
 
class Test
{
  protected:
    int x;
  public:
    Test (int i):x(i) { }
    void fun() const  { cout << "fun() const " << endl; }
    void fun()        {  cout << "fun() " << endl;     }
};
 
int main()
{
    Test t1 (10);
    const Test t2 (20);
    t1.fun();
    t2.fun();
    return 0;
}

A. fun() fun() const

B. fun() const fun()

C. fun() fun()

D. fun() const fun() const

3 / 15

3. Observer the given C++ program carefully and choose the correct output from the given options:

#include   
#include   
using namespace std;  
int main()  
{  
    cout<::value; // case A  
    cout<::value; // case B  
    cout<::value;  // case c  
    return 0;  
}

A. 11O

B. OO1

C. O1O

D. none of the above

4 / 15

4. Which of the following C++ code will give error on compilation?

================code 1=================
#include 
using namespace std;
int main(int argc, char const *argv[])
{
	cout<<"Hello World";
	return 0;
}
========================================
================code 2=================
#include 
int main(int argc, char const *argv[])
{
	std::cout<<"Hello World";
	return 0;
}
========================================

A. Code 1 only

B. Neither code 1 nor code 2

C. Both code 1 and code 2

D. Code 2 only

5 / 15

5. What will be the output of the following C++ code?

#include 
#include 
using namespace std;
int main()
{
	cout<::type>::value;
	cout<::type>::value;
	return 0;
}

A. 11

B. 12

C. 21

D. 22

6 / 15

6. What is do-while loop also known as?

A. Exit Control

B. Entry Control

C. Per Tested

D. all of the above

7 / 15

7. How structures and classes in C++ differ?

A. Structures by default hide every member whereas classes do not

B. In Structures, members are public by default whereas, in Classes, they are private by default

C. Structures cannot have private members whereas classes can have

D. In Structures, members are private by default whereas, in Classes, they are public by default

8 / 15

8. Would destructor be called, if yes, then due to which vector?

#include 
#include 
using namespace std;
 
class a
{
public :
    ~a()
    {
        cout << "destroy";
    }
};
int main()
{
   vector  *v1  = new vector;
   vector  *v2  = new vector;
   return 0;
}

A. v1

B. v2

C. v1 and v2

D. no destructor call

9 / 15

9. Under which pillar of OOPS does base class and derived class relationship come?

10 / 15

10. Consider the following given program and choose the most appropriate output from the given options:

#include   
using namespace std;   
class Base {   
public:   
    Base()     
    { cout<<"Constructing Base n"; }   
    ~Base()   
    { cout<<"Destructing Base n"; }     
};   
class Derived: public Base {   
public:   
    Derived()      
    { cout<<"Constructing Derived n"; }   
    ~Derived()   
    { cout<<"Destructing Derived n"; }   
};   
   
int main(void)   
{   
    Derived *d = new Derived();   
    Base *b = d;   
    delete b;   
    return 0;   
}

A. Constructing Base, Constructing Derived, Destructing Base, Destructing Derived

B. Constructing Base, Constructing Derived, Destructing Base

C. Constructing Base, Constructing Derived, Destructing Derived, Destructing Base

D. none of the above

11 / 15

11. What is C++?

A. C++ is an object oriented programming language

B. C++ is a procedural programming language

C. C++ supports both procedural and object oriented programming language

D. C++ is a functional programming language

12 / 15

12. What will be the output of the following C++ code?

#include 
using namespace std;
void square (int *x, int *y)
{
	*x = (*x) * --(*y);
}
int main ( )
{
	int number = 30;
	square(&number, &number);
	cout << number;
	return 0;
}

A. 30

B. Error

C. Segmentation fault

D. 870

13 / 15

13. What will be the output of the following C++ code?

        #include 

        using namespace std;

        int gcd (int a, int b)

        {

            int temp;

            while (b != 0) 

            {

                temp = a % b;

                a = b;

                b = temp;

            }

            return(a);

        }

        int main ()

        {

            int x = 15, y = 25;

            cout << gcd(x, y);

            return(0);

        }

14 / 15

14. How can one implement the run-time Polymorphism in the C++ programming language?

A. By using the Template

B. By using the concepts of inheritance

C. By using both the virtual functions and inheritance

D. By using only the virtual functions

15 / 15

15. Pick the incorrect statement about Character-Array.