Classical

Object Oriented Programming - Classes

6:  

Choose the correct statements from the following: 

A.

In a struct, the access control is public by default.

B.

In a class, the access control is private by default.

C.

In a class, the access control is public by default.

D.

Both (a) & (b)

 
 

Option: D

Explanation :


7:  

The fields in a class, of a C++ program are by default   

A.

protected

B.

public

C.

private

D.

none of the above

 
 

Option: C

Explanation :


8:  

Class A

{

int  i1;

protected :

int  i2;

public :

int i3;

}

class B : public A

{

public :

int i4;

};

class C :B

{

};

The variable i2 is accessible     

A.

to a public function in class A

B.

to a public function in cIa s s B

C.

to a public function in class C

D.

from the main function

 
 

Option: C

Explanation :


9:  

Class A

{

int  i1;

protected :

int  i2;

public :

int i3;

}

class B : public A

{

public :

int i4;

};

class C :B

{

};

Which varilible(s) is/are accessible from the main function?     

A.

i1

B.

i 2

C.

i 3

D.

None of the above

 
 

Option: D

Explanation :


10:  

The following program
class abc;
class def
{
int i1 ;                        // statement 1
protected: int i2;   // statement 2
public: int i3;       //statement 3
friend abc;
} ;
class abc
{
public:
void main(def A)
{
cout << (A.i1=3);
cout <<  (A.i2=4);
cout << (A.i3=5);
}
} ;
void main( )
{
def x1 ;
abc x2 ;
x2.mn(x1);
}    

A.

will compile successfully if statement 1 is removed

B.

will compile successfully if statement 2 is removed

C.

will compile successfully if statement 3 is removed

D.

will run successfully and print 34 5

 
 

Option: D

Explanation :

Since abc is a friend of def, it can access all its data, does not matter whether it is declared private, protected or public.




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Syllabus covered in this section is-

  • O-O Programming Concepts , Class object instantiation
  • Inheritance, polymorphism and overloading
  • C++ Prograinming - Elements of C++, Tokens,
  • Identifters Variables and constants, data, types
  • Operators, Control, statements
  • Functions
  • Parameter passing
  • Class and objects
  •  Constructors and destructors
  •  Overloading,  Inheritance,
  • Templates, Exception handling

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