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

C++ Interview Question and Answers Part 12


111.What are different types of Comments in C++ and explain each of them?

  • There are two types of comments in C++ Programming language.

    1. Single line comment.

    2. Multi line comments.

Single line comment

  • Single line comments is accomplished by double-slash (//).

  • Everthing that is followed by double-slash till the end of line is ignored by the compiler.

  • It is reffered as C/C++-style comments as it is originally part of C/C++ programming.

  • start with double slash symbol (//) and terminate at the end of the line.

Multi line comment

  • Multi-line comments starts by using forward slash followed by asterisk (/*) and ends by using asterisk followed by forward slash (*/).

  • Everthing between (/*) and (*/) are ignored by compiler whether it is one or more than one line or a block of code.

  • It is reffered as C-Style comment as it was introduced in C programming. But later on this comments where added in C++.


112.What are C++ Constants or Literals?

  • Constants or Literals are data with fixed or known value.

  • In C++, Constants is entity that doesn't change.


113.What are Types of Constants and explain each of them in?

  • There are three types of Constants.

    1. Integer Constant

    2. Real Constant

    3. Character Constant

Integer Constant:

  • An Integer constant must have at least one digit and no decimal point.

  • Can be either Positive or Negative, number without sign is considered as Positive.

  • Commas or Blank are not allowed.

  • Values for Integer Constant can range from -32768 to 32767.

  • For example 121, 4100, -7500

Real Constant:

  • Real Constant can be in form of Fractional or Exponential format.

  • Must have at least digit and Decimal Point.

  • Can be either Positive or Negative, number without sign is considered as Positive.

  • Commas or Blank are not allowed.

  • For example 125.75, -211.15, 560.01 etc.

  • In Exponential format, it has two parts, mantissa and Exponent. Both are separated by letter E or e. Mantissa is either integer or real and Exponent must be integer. (For e.g. 1.25E6,-0.5e+3, 4.1e-5 ).

Character Constant:

  • Character constant is a single alphabet, a single digit or special symbol enclosed within single inverted commas.

  • Maximum length of character constant is only 1 character.

  • For example 'a', 'E', 'S', '+', '?'


114.What is Variables in C++?

Variable are placeholder to store values. Also called as identifiers.

As value varies from time to time, it is called variable.

Variable names are name given to location in memory. Those memory location can contain integer, real or character data.

Every variable is identified by a unique name.


115.Explain Operators and different types of Operators in C++?

  • The variables, which are declared and defined, are the operands which are operated upon by the operators.

  • Operators specify what operations are to be performed on the operands.

  • Some operators require two operands, while few operators require only one operand.

  • C++ includes many operators, which fall into different categories as follows.







116.What is While Loop Statement in C++?

  • When a loop is described with a while statement , you can only specify the looping condition.

  • It is an entry controlled loop.

  • If the result of loop condition is true then the loop block is executed.

  • When the result of loop condition become false, it executes next statements, written after block scope.


117.What is do…while loop statement in C++?

  • The do-while statement is different from while because it first executes the statement blocks and then checks the condition.

  • It is an exit controlled loop.

  • Thus the loop is executed at least once, irrespective the condition is true or false. Where as in do statement, it check the condition first, and if result of condition is true, statement block will be executed.

118.What is goto Statement in C++?

  • Goto statement is used for branching to another part of program.

  • With the help of goto statement we can pass control to another statement within program.


119.How break and Continue Statement is done in C++?

  • Break and continue statement is use for, do, do..while loop for all iterations.

  • In normal operation, loop is terminated when condition become false.

  • Inside a loop flow can be controlled using break and continue.

  • Loop block continue various statements. When program executes continue statement, it will skips over the rest of statement in the loop, and control goes on to the beginning of loop.

  • Inside loop block, when program control executes break statement, the current loop is terminated abruptly, it comes out of loop forever.

  • This feature is used within loop for two termination points. One when condition is false and second when it comes across break statement within loop.


120.What is Arrays in C++?

A Variable store only one value.

  • Where is Array helps to store several value of same data type under single variable name.

  • An array is a set of related data items i.e. all of them belong to the same data type and can be accessed by a common name.

  • An array is a derived data type.

  • An array in C++ Programming Language can be defined as number of memory locations, each of which can store the same data type and which can be references through the same variable name.

  • Thus an array is a collection of similar elements. These similar elements could be all integers, all floats or all characters etc.