Question: 6 -

Which among the following is called first, automatically, whenever an object is created?

New

Class

Trigger

Constructor

Answer:

Constructor

Solution:

Constructors are the member functions which are called automatically whenever an object is created. It is a mandatory functions to be called for an object to be created as this helps in initializing the object to a legal initial value for the class.

Question: 7 -

Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort

Are created

Are called

Are not called

Are inherited

Answer:

Are not called

Solution:

Destructors Are not called for automatic objects if the program terminates with a call to function exit or function abort

Question: 8 -

What will be the output of the following program?

#include <iostream>
using namespace std;
class LFC {
    LFC() { cout << "Constructor called"; }
};

int main()
{
   LFC t1;
   return 0;
}

Runtime Error

Constructor called

Compiler Error

destructor for id 1

Answer:

Compiler Error

Solution:

By default all members of a class are private. Since no access specifier is there for find(), it becomes private and it is called outside the class when t1 is constructed in main.

Question: 9 -

Which contructor function is designed to copy object of same class type?

Copy constructor

Create constructor

Dynamic constructor

Object constructor

Answer:

Copy constructor

Solution:

Copy constructor function is designed to copy object of same class type.

Question: 10 -

Which of the following is true about constructors.

i) They cannot be virtual

ii) They cannot be private.

iii) They are automatically called by new operator.

i & iii

ii & iii

All i,ii,iii

i & ii

Answer:

i & iii

Solution:

i) True: Virtual constructors don't make sense, it is meaningless to the C++ compiler to create an object polymorphically. ii) False: Constructors can be private