Computer Science
Practical Viva-Voce questionsQ. 1. Differentiate between a run-time error and syntax error. Give one example of each.
[Hint : Losic & Syntax]
Q. 2. Differentaite between a data type struct and a data type class in C++. What is the need for a
constructor function in an object. [Hint : Structures & Classes]
Q. 3. Is it possible to apply Binary Search for any sorted data? Justify.
[Hint : Yes]
Q. 4. Differentiate between a LIFO list and FIFO list.
[Hint : Stacks & Queues]
Q. 5. Write any two differences between Procedural Programming and Object Oriented
Programming. [Hint : Basic & C++]
Q. 6. What is a pointer?
[Hint : Address variable]
Q. 7. What is a Queue?
[Hint : LIFO]
Q. 8. What is the purpose of comments and indentation in a program?
[Hint : Remark]
Q. 9. List four built-in data types available in C++.
[Hint : Data Types]
Q. 10. Why arrays are called static data structure?
Q. 11. Distinguish between serial file and a sequential file.
[Hint : File Hadling]
Q. 12. What do you mean by Inheritence?
[Hint : Classes & Derived Classes]
Q. 13. What are constructors & destructors. What purpose do they serve.
[Hint : Class Functions]
Q. 14. Distinguish between an object and a class.
[Hint : Variables & Data Types]
Q. 15. What is the pre-condition for Binary Search to be performed on a single dimensional
array? [Hint : sorting]
Q. 16. Differentiate between a Character constant and a string literal or constant.
[Hint : String]
Q . 17. Differentiate between the privately & publicly derived visibility modes.
[Hint : Local & Global]
Q. 18. What is meant by linear data structure?
[Hint : Serial Data]
Q. 19. What is a Deque?
[Hint : Data Structures]
Q. 20. Differentiate between privately and publicly derived visibility modes.
[Hint : Data Hiding]
Q.21. What is a copy constructor.
[Hint : Member Function]
Q.22. Define the term sorting and searching.
Q. 23. Differentiate between static data structure & dynamic structure.
[Hint : Data Types]
Q. 24. Define the following terms: Inheritance & Encapsulation.
[Hint : OOP]
Q. 25. What is a copy constructor. What do you understand by constructor overloading.
[Hint : Function]
Q. 26. Write two major differences between Object Oriented Programming and Procedural
Programming.
[Hint : BASIC&C++]
Q. 27. What do you understand by constructor and destructor functions used in classes. How are
these functions different from other member functions. [Hint : Classes & Objects]
Q. 28. Differentiate between ifstream class and ofstream class.
[Hint : Reading/Writing]
Q. 29. Why main function is special. Give two reasons.
[Hint : Program instractions]
Q. 30. What do you understand by visibility modes in class derivations. What are these modes.
[Hint : Public, Private & Protected]
Q. 31. Differentiate between read( ) & write( ) functions.
[Hint : Read & Write records]
Q. 32. Write two advantages of using include compiler directive.
[Hint : Header Files]
Q. 33. What do you understand by default constructor and copy constructor functions used in
classes? How are these functions different from normal constructors? [Hint : Member functions]
Q. 34. Differentiate between getline( ) & getc( ) functions.
[Hint : String input]
Q. 35. Illustrate the concept of Function Overloading with the help of an example.
[Hint : Multiple Methods]
Q.36. Illustrate the use of the this pointer with the help of an example.
[Hint : Classes & Objects]
Q. 37. Encapsulation is one of the major properties of OOP. How is it implemented in C++.
[Hint : OOP features]
Q. 38. Illustrate the use of “Self Referential Structures” with the help of an example.
[Hint : Data types]
Q. 39. Reusability of classes is one of the major properties of OOP. How is it implemented in
C++.
[Hint : Objecters & Classes]
Q .40. Distinguish between: int*ptr=new int(5); & int * ptr= new int[5];
[Hint : Points & Array]
Q .41. Distinguish between ios::out & ios::app.
[Hint : File output/Append]
Q. 42. What is the purpose of Header file in a program.
[Hint : Include functions]
Q. 43. What do you understand by a Base Class and a Derived Class. If a base class and a
derived class each include a member function with the same name and arguments, which member function will be called by the object of the derived class if the scope operator is not used.
[Hint : Polymorphism]
[Hint : OOPS]
Q. 45. What is the difference between put( ) and write( ).
[Hint : Read & Write records]
Q. 46. Will a C compiler always compile C++ code?
[Hint : NO]
Q. 47. Which is not a valid keyword: public, protected, guarded
[Hint : „g‟]
Q. 48. What is the correct syntax for inheritance
a. class aclass : public superclass b. class aclass inherit superclass c. class aclass <-superclass [Hint : (a)]
Q. 49. What does the following do: for(;;) ;
[Hint : loop]
Q. 50. Of the numbers 12 23 9 28 which would be at the top of a properly implemented
maxheap? [Hint : Arrays]
Q. 51. What does the break; do in the following?
void afunction() { if(1) { break; a_function(); cout<<“Err”; } } [Hint : Breaks loop]
Q. 52. What are pointers, when declared, intialized to?
Q. 53. What is the last index number in an array of 100 characters?
[Hint : Array option Bare]
Q. 54. Would you rather wait for quicksort, linear search, or bubble sort on a 200000 element
array? (Or go to lunch...) [Hint : Dry Run]
Q. 55. What does the following algorithm do?
set sum to zero. set i to 1. input n.
while i is less than or equal to n do {
add i to sum. increment i. }
output sum.
What would be output if the value entered for n was 0? What would be the effect of reversing the order of the statements in the loop body on the general result produced by the algorithm?
[Hint : Dry Run]
Q. 56. If an array has a 100 elements what is the allowable range of subscripts?
[Hint : Array option base]
Q. 57. What is the difference between the expressions a4 and a[4]?
[Hint : Variable & Arrary]
Q. 58. Write a declaration for a 100 element array of floats. Include an initialisation of the first
four elements to 1.0, 2.0, 3.0 and 4.0. [Hint : Array initialialion of arrays]
Q. 59. An array day is declared as follows:
int day[] = {mon, tue, wed, thu, fri};
How many elements has the array day? If the declaration is changed to int day[7] = {mon, tue, wed, thu, fri};
[Hint : Array definition]
Q. 60. What would be output by the following section of C++?
int A[5] = {1 , 2, 3, 4}; int i;
for (i=0; i<5;> [Hint : Dry Run]
Q. 61. What is wrong with the following section of program?
int A[10], i;
for (i=1; i<=10; i++) cin >> A[i]; [Hint : Dry run]
Q. 62. Write a function heading for a function which will double the first n elements of an array.
If the function was amended so that it would return false if n was larger than the size of the array how should the function heading be written? If the function was to be changed so that a new array was produced each of whose elements were double those of the input array how would the heading be written?
[Hint : Function definition]
Q. 63. What does the following do: void afunction(int *x)
{ x=new int; *x=12; } int main() { int v=10; afunction(&v); cout<
[Hint : Dry Run]
Q. 64. What do nonglobal variables default to:
a. auto b. register c. static
Q. 65. Which header file allows file i/o with streams?
a. iostream.h b. fstream.h c. fileio.h [Hint : File stream]
Q. 66. What is the outcome of cout<
a. 16 b. 17 c. 16.5 [Hint : Dry run]
Q. 67. What will strcmp(“Astring”, “Astring”); return?
[Hint : String compare]
Q. 68. Evaluate !(1&&1||1&&0)
[Hint : Logical Condition]
Q. 69. What header file is needed for exit();
[Hint : Process]
Q. 60. What ANSI C++ function clears the screen?
