By | 27.12.2016

# Octal Number to Decimal using functions

Write a C++ Program to Convert Octal Number to Decimal using functions. Here’s simple C++ Program to Convert Octal Number to Decimal using functions in C++ Programming Language.

## What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

## Defining a Function : :

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ Program to Convert Octal Number to Decimal using functions which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/* C++ Program to Convert Octal Number to Decimal using functions */

#include <iostream>
#include <cmath>
using namespace std;

int octalToDecimal(int octalNumber);

int main()
{
int octalNumber;
cout << "\nEnter any octal number :: ";
cin >> octalNumber;

cout <<"\n [ " << octalNumber << " ] in octal = [ " << octalToDecimal(octalNumber) << " ] in decimal.\n";

return 0;
}

// Function to convert octal number to decimal
int octalToDecimal(int octalNumber)
{
int decimalNumber = 0, i = 0, rem;
while (octalNumber != 0)
{
rem = octalNumber % 10;
octalNumber /= 10;
decimalNumber += rem * pow(8, i);
++i;
}
return decimalNumber;
}```

### OUTPUT : :

```/* C++ Program to Convert Octal Number to Decimal using functions */

Enter any octal number :: 144

[ 144 ] in octal = [ 100 ] in decimal.

Process returned 0```

Above is the source code for C++ Program to Convert Octal Number to Decimal using functions which is successfully compiled and run on Windows System.The Output of the program is shown above .

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