Classical

Object Oriented Programming - Find Output

1:  

The following program fragment
int i=10;
void main ( )

{
int i=20;
{

int i=30.;
cout << i << :: i ;    
}
}

A.

prints 3010

B.

prints 3020

C.

will result in a run time error

D.

none of the above

 
 

Option: A

Explanation :

:: is basically meant to manipulate a global variable, in case a local variable also has the same name.


2:  

A function abc is defined as
void abc (int x=0, int y=0)
{
cout << x << y;
}

Which of the following function calls is/are illegal? (Assume h, g are declared as integers)   

A.

abc () ;

B.

abc (h) ;

C.

abc (g, h) ;

D.

None of the above

 
 

Option: D

Explanation :

Both the arguments are optional. All the calls are legal.


3:  

The following c++ code results in
#include "iostream.h"
void main (void)

{
cout <<  (int i=5) << (int j=6);

}    

A.

compilation error

B.

run time error

C.

link time error

D.

none of the above

 
 

Option: A

Explanation :


4:  

The statements
int a = 5;
cout << "FIRST" << (a <<2) << "SECOND";
outputs 

A.

FIRST52SECOND

B.

FIRST20SECOND

C.

SECOND25FIRST

D.

an error message

 
 

Option: B

Explanation :

The symbol <<  has a context sensitive meaning. The <<  in (a << 2) means shifting a by 2 bits to the left, which is nothing but multiplying it by 4. So, a < <2 will be 5 x 4 = 20 and hence the output will be FIRST20SECOND.


5:  

The following program fragment   
void main ( )
{
int x=10;
int &p=x;
cout << &p <<  &x;
}      

A.

prints 10 and the address of x

B.

prints the address of p twice

C.

prints the address of x twice

D.

Both (b) & (c)

 
 

Option: D

Explanation :

int &p=x aliases p to x. This means they refer to the same memory location. So, the address of x will be same as that of p.




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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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  • Post Graduate Computer Science Exam
  •  PhD Entrance Exam
  • Computer Engineering

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