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 2

 

11. OK, why does this work?

  • If a list is circular, at some point pointer2 will wrap around and be either at the item just before pointer1, or the item before that.

  • Either way, it’s either 1 or 2 jumps until they meet

 

12.What is virtual constructors/destructors?

Virtual destructors:

  • If an object (with a non-virtual destructor) is destroyed explicitly by applying the delete operator to a base-class pointer to the object, the base-class destructor function (matching the pointer type) is called on the object.

  • There is a simple solution to this problem declare a virtual base-class destructor.

  • This makes all derived-class destructors virtual even though they don’t have the same name as the base-class destructor.

  • Now, if the object in the hierarchy is destroyed explicitly by applying the delete operator to a base-class pointer to a derived-class object, the destructor for the appropriate class is called. Virtual constructor: Constructors cannot be virtual.

  • Declaring a constructor as a virtual function is a syntax error.

 

13.Virtual constructor: Constructors cannot be virtual. Declaring a constructor as a virtual function is a syntax error. Does c++ support multilevel and multiple inheritance?

  • Yes.

 

14.What are the advantages of inheritance?

  • It permits code reusability.

  • Reusability saves time in program development.

  • It encourages the reuse of proven and debugged high-quality software, thus reducing problem after a system becomes functional.

 

15.What is the difference between declaration and definition?

  • The declaration tells the compiler that at some later point we plan to present the definition of this declaration.
    E.g.:

void stars () //function declaration

The definition contains the actual implementation as below.

E.g.:

void stars () // declarator

{

for(int j=10; j>=0; j--) //function body or function definition

cout<<”*”;

cout<<endl;

}

 

16.What is the difference between an ARRAY and a LIST?

  • Array is collection of homogeneous elements

  • List is collection of heterogeneous elements.

  • For Array memory allocated is static and continuous.

  • For List memory allocated is dynamic and Random.

  • Array: User need not have to keep in track of next memory allocation.

  • List: User has to keep in Track of next location where memory is allocated.

 

17.Does c++ support multilevel and multiple inheritance?

  • Yes.

 

18.What is a template?

  • Templates allow to create generic functions that admit any data type as parameters and return value without having to overload the function with all the possible data types.

  • Until certain point they fulfill the functionality of a macro. Its prototype is any of the two following ones template <class indetifier> function_declaration; template <typename indetifier > function_declaration;

  • The only difference between both prototypes is the use of keyword class or typename, its use is indistinct since both expressions have exactly the same meaning and behave exactly the same way.

 

19.Define a constructor - What it is and how it might be called (2 methods).

  • constructor is a member function of the class, with the name of the function being the same as the class name.

  • It also specifies how the object should be initialized.

  • Ways of calling constructor:

  • Implicitly: automatically by complier when an object is created.

  • Calling the constructors explicitly is possible, but it makes the code unverifiable.

20.You have two pairs: new() and delete() and another pair : alloc() and free(). Explain differences between eg. new() and malloc()

1.)“new and delete” are preprocessors while “malloc() and free()” are functions. [we dont use brackets will calling new or delete].

2.) no need of allocate the memory while using “new” but in “malloc()” we have to use “sizeof()”.

3.) “new” will initlize the new memory to 0 but “malloc()” gives random value in the new alloted memory location [better to use calloc()]

 

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