Question 1

#include<iostream> using namespace std;class X{public:int x;};int main(){X a = {10};X b = a;cout <<a.x <<" " <<b.x; return 0;}

Accepted Answer

A)  compiler error
B)  10 followed by garbage value
C)  10 10
D)  10 0 D

Question 2

Which of the following is true?

Accepted Answer

A)  all objects of a class share all data members of class
B)  objects of a class do not share non-static members. every object has its own copy
C)  objects of a class do not share codes of non-static methods, they have their own copy
D)  none B

Question 3

Which of the following approach is adopted in C++?

Accepted Answer

A)  top down
B)  bottom up
C)  horizontal
D)  vertical B

Question 4

How many objects can be created from an abstract class?

Accepted Answer

A)  zero
B)  one
C)  two
D)  as many as we want

Question 5

C++ was originally developed by ….......

Accepted Answer

A)  donald knuth
B)  bjarne sroustrups
C)  dennis ritchie
D)  none of these

Question 6

Which of the following is true about new when compared with malloc.
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn't
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Accepted Answer

A)  1 and 3
B)  2 and 3
C)  1 and 2
D)  all 1,2,3

Question 7

Is it fine to call delete twice for a pointer?#include<iostream> using namespace std;int main(){int *ptr = new int; delete ptr;delete ptr; return 0;}

Accepted Answer

A) True 
 B)False

Question 8

If particular software can be used in some other application than the one for which it is created then it reveals ….........

Accepted Answer

A)  data binding
B)  data reusability
C)  data encapsulation
D)  none of these

Question 9

The main intention of using inheritance is ….........

Accepted Answer

A)  to help in converting one data type to other
B)  to hide the details of base class
C)  to extend the capabilities of base class
D)  to help in modular programming

Question 10

Which of the followings is/are automatically added to every class, if we do not write our own.

Accepted Answer

A)  copy constructor
B)  assignment operator
C)  a constructor without any parameter
D)  all of the above

Question 11

Which of the following data type does not return anything?

Accepted Answer

A)  int
B)  short
C)  long
D)  void

Question 12

Which of the following statements is correct for a static member function?
1) It can access only other static members of its class.
2) It can be called using the class name, instead of objects

Accepted Answer

A)  only 1 is correct
B)  only 2 is correct
C)  both 1 and 2 are correct
D)  both 1 and 2 are incorrect

Question 13

Which of the following interface determines how your program will be used by other program?

Accepted Answer

A)  public
B)  private
C)  protected
D)  none of these

Question 14

What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;

Accepted Answer

A)  compile time error
B)  run time error
C)  no effect

Question 15

Predict the output of following C++ program#include<iostream> using namespace std;class Empty {}; int main(){cout <<sizeof(Empty); return 0;}

Accepted Answer

A)  a non zero value
B)  0
C)  compile time error
D)  runtime error

Question 16

Which feature of C++ contain the concept of super class and subclass?

Accepted Answer

A)  class and object
B)  encapsulation
C)  abstraction
D)  inheritance

Question 17

What is the difference between struct and class in C++?

Accepted Answer

A)  all members of a structure are public and structures don't have constructors and destructors
B)  members of a class are private by default and members of struct are public by default. when deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.
C)  all members of a structure are public and structures don't have virtual functions
D)  all above

Question 18

Which of the following is true about the following program#include class Test{public:int i;void get();};void Test::get(){std::cout <<"Enter the value of i: "; std::cin >>i;}Test t; // Global object int main(){Test t; // local object t.get();std::cout <<"value of i in local t: "<

Accepted Answer

A)  compiler error: cannot have two objects with same class name
B)  compiler error in line "::t.get() ;"
C)  compiles and runs fine

Question 19

Output of following program?#include<iostream> using namespace std; class Point {Point() { cout <<"Constructor called"; }};int main(){Point t1; return 0;}

Accepted Answer

A)  compile time error
B)  run time error
C)  constructor called

Question 20

class Test { int x;};int main(){Test t; cout <<t.x; return 0;}

Accepted Answer

A)  0
B)  garbage value
C)  compile time error

Exam 4: C++ Programming and Concepts: Inheritance, Data Types, Objects, and Output Prediction

#include<iostream> using namespace std;class X{public:int x;};int main() {X a = {10};X b = a;cout <<a.x <<" " <<b.x; return 0;}