# C Program To Convert Octal to Decimal

C program to convert octal numbers to decimal numbers; Through this tutorial, we will learn how to convert octal numbers to decimal numbers in c programs with the help of functions.

## Algorithm to Convert Octal to Decimal

Use the following algorithm to write a program to convert octal numbers to decimal numbers; as follows:

• Take an input octal number from user and stored in an int type variable say octal.
• Create A function, which name convert().
1. Digits of octal are extracted one by one starting from right.

int rem = octal%10;

2. Extracted digits are multiplied with proper base i.e. power of 8.

int res = rem*pow(8,i);

3. After multiplying each digit with proper base the results are added and stored in another variable say decimal.

decimal += res;

• Call Convert function with parameters.
• The output is printed.

## C Program To Convert Octal to Decimal

```    #include <stdio.h>

// Function to convert octal number to decimal

int convert(int octal)

{

int decimal = 0, i = 0;

//converting octal to decimal

while (octal != 0)

{

int rem = octal % 10;

octal /= 10;

int res=rem*pow(8,i);

decimal += res;

i++;

}

return decimal;

}

//main program

int main()

{

int octal;

printf("Enter an octal number: ");

//user input

scanf("%d", &octal);

//calling function

int decimal=convert(octal);

//printing output

printf( " %d in octal = %d in decimal", octal, decimal);

return 0;

}
```

The output of the above c program; as follows:

`Enter an octal number: 120255120255 in octal = 41133 in decimal`

## AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.