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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Function() in C++ tutorials

  • Till now we have worked with main() function only. It is one and only function that consists of header and body of program. Now its time to use another function.

  • For smaller program main() function is sufficient, while for complex and bigger program we can write separate functions and call it. This is known as function call, which is point at which function is called, where by actual function is inserted in program during linking to library files.

  • When program becomes large, it becomes difficult to manage it as single program. Hence one can divide program into smaller parts known as functions.

  • Function act individually and gives result.

  • Similarly, statements required repeatedly within programs can be written once as function, and can be called many times.

  • A function is a self-contained program that carries out some specific task.

  • Each C++ Program consists of one or more functions.

  • One of this function must be main(). Program execution begin from main( ). And each function in program is called in the sequence specified by function call in main().

  • Additional functions will be subordinate to main().

  • After each function completes its task, control returns to main(). When all statements and other function calls completes, the program ends.


Components of Function

Function() consist of following components.

    1. Declaration.

    2. Definition

    3. Function call


Declaration :

  • This part only specify type of function and type of arguments it takes.

  • Typical type of function could be value returned by the function, it could be int, float, char.

  • If function does not return any value it will be void.


Definition :

  • This is complete part of function. It consists of header and block of statements.

  • Header is same as declaration where as body contains executable statements.

  • Memory is allocated to function for definition and not for declaration.


Function call :

  • A function can be accessed or called by specifying its names, followed by list of arguments, enclosed in ( ) brackets and separated by commas.

  • If function call does not require any arguments, it must be followed by empty ( ) brackets.

  • Each arguments if any must be in form of variable, constant or valid expression.


C++ Program enter Radius and calculate Area of circle by using function.

Sam Sir


//Program name test071.cpp

//WAP enter Radius and calculate Area of circle by using function.

#include <iostream.h>


void area(float);

void main()


float rad;

cout<<"Enter Radius of Circle : ";





void area(float r)


cout<<"Area of Circle = "<<r*r*3.14;



Enter Radius of Circle : 10

Area of Circle = 314


C++ Program to enter 2 numbers and print product of both using function

Sam Sir


//Program name test072.cpp

//WAP to enter 2 numbers and print Product of both using function

#include <iostream.h>

#include <string.h>

void prod(int,int);


void main()

{int a,b;

cout<<"Enter Two numbers : ";





void prod(int x,int y)


cout<<"Product of two numbers = "<<x * y;



Enter Two numbers : 2 25

Product of two numbers = 50


Enter Two numbers : 4 5

Product of two numbers = 20


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