C++ Programming

1. Computer Programming 2. History of Prog.Language 3. Introduction to C++ 4. OOPS 5. Features of C++ 6. Starting Turbo C++ 7. C++ Tokens 8. Basic requirment of C++ 9. Comments 10. My First Program in C++ 11. Line Break 12. C++ Escape Sequence 13. Constants or Literals 14. Variable in C++ 15. Data Types in C++ 16. Range of data types in C++ 17. Declare Variables 18. Reserved Key Words 19. cout<< 20. Chained & Embedded state 21. Prog.to print sum of 2 nos 22. cin>> 23. Prg.to print sum & average 24. Area & Perimeter of Rectangle 25. Area Circumference of Circle 26. Prg.for Simple Calculator 27. Operatos in C++ 28. Ex. Of Operators 29. Swap two numbers 30. Hierarchy of Operators 31. if( ) statement 32. Prg.to check +ve,-ve or zero 33. if..else statement 34. Prg.to check Odd or Even 35. Prg.to print larger of 2 nos 36. Prg.to print largest of 3 nos 37. Prg.to check divisibility 38. Prg.to check print range 39. for. . . loop statement 40. prg.to print series of nos 41. Prg.to check divisibility 42. prg.to print sum of series 43. Prg.to print Pyramid 44. prg.for Factorial 45. prg.to fill screen 46. prg.for largest/smallest no 47. prg.to print reverse no 48. prg.to add each digit 49. prg.for sum of factorial 50. prg.for fibonacci series 51. prg.to check Prime nos 52. prg. Prime no from 1 to 100 53. prg.Specified Prime nos 54. while( ) statement 55. do. . While statement 56. goto statement 57. break & continue statement 58. switch case statement 59. Array in C++ 60. print reverse order using array 61. Ascending/Descending order 62. prg.to search no in Array 63. Double Dimension Array 64. String in C++ 65. String with spaces in C++ 66. prg.to print string in reverse 67. prg.to count A,E,I,O,U vowel 68. Function( ) in C++ 69. Function program examples 70. General Purpose Programs 71. Loan & EMI calculation prg. 72. Table print prg. 73. Leap year program 74. lower to UPPER case prg. 75. Age Distribution prg. 76. Bank note calculation prg. 77. Simple Interest prg. 78. Compound Interest prg. 79. Simple Depreciation prg. 80. Reducing bal.Depreciation prg. 81. Marksheet prg. 82. Income Tax prg. 83. Time calculator prg. 84. Distance converter prg. 85. Volume Air Calculation prg. 86. Time to fill Water Tank prg. 87. Salary Calculation prg. 88. Total Sale Calculation prg. 89. Male/Female percentage prg. 90. Library Rent prg. 91. Office Expence prg. 92. Total Salary Calculation prg. 93. Profit or Loss prg. 94. Total Profit/Loss prg. 95. Convert Amt to Word. 96. ASCII Table 97. C++ Operators 98. C & C++ Reserved Keyword 99. C & C++ Pre-Define Function 100. C++ Interview Part1 101. C++ Interview Part2 102. C++ Interview Part3 103. C++ Interview Part4 104. C++ Interview Part5 105. C++ Interview Part6 106. C++ Interview Part7 107. C++ Interview Part8 108. C++ Interview Part9 109. C++ Interview Part10 110. C++ Interview Part11 111. C++ Interview Part11
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C++ Interview Question and Answers Part 4

 

31.What are 2 ways of exporting a function from a DLL?

  • Taking a reference to the function from the DLL instance.

  • Using the DLL ís Type Library

 

32.Suppose that data is an array of 1000 integers. Write a single function call that will sort the 100 elements data [222] through data [321].

  • quicksort ((data + 222), 100);

 

33.What is a class?

  • Class is a user-defined data type in C++. It can be created to solve a particular kind of problem.

  • After creation the user need not know the specifics of the working of a class.

 

34.What is friend function?

  • As the name suggests, the function acts as a friend to a class.

  • As a friend of a class, it can access its private and protected members.

  • A friend function is not a member of the class. But it must be listed in the class definition.

 

35.Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array?

  • Mergesort always makes recursive calls to sort subarrays that are about half size of the original array, resulting in O(n log n) time.

 

36.What is abstraction?

  • Abstraction is of the process of hiding unwanted details from the user.

 

37.What are virtual functions?

  • A virtual function allows derived classes to replace the implementation provided by the base class.

  • The compiler makes sure the replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer.

  • This allows algorithms in the base class to be replaced in the derived class, even if users don't know about the derived class.

 

38.What is the difference between an external iterator and an internal iterator? Describe an advantage of an external iterator.

  • An internal iterator is implemented with member functions of the class that has items to step through.

  • An external iterator is implemented as a separate class that can be "attach" to the object that has items to step through.

  • An external iterator has the advantage that many difference iterators can be active simultaneously on the same object. 

 

39.What is a scope resolution operator?

  • A scope resolution operator (::), can be used to define the member functions of a class outside the class.

 

40.What do you mean by pure virtual functions?

  • A pure virtual member function is a member function that the base class forces derived classes to provide.

  • Normally these member functions have no implementation. Pure virtual functions are equated to zero.

class Shape

{

public: virtual void draw() = 0;

};

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