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C Program to Convert Binary to Octal

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In this tutorial, we will write a C program to convert a binary number into octal using a while loop. Before that, you must have knowledge of the following topics in C.

Binary number

The binary numbers are based on 0 and 1, so it is a base 2 number. They are the combination of 0 and 1. For example, 1001, 110101, etc.

Octal number

The octal numbers are the numbers with base 8 and use the digits 0 to 7. Example: 8 in decimal is represented as 10 in octal, 25 as 31, and so on.

Example:

Input: 101001
Output: 51

Let us go through a program for the Binary to Octal Conversion in C.

C Program to Convert Binary to Octal

Source Code: convert binary to octal using a function in C

#include <stdio.h>
#include <math.h>

int conversionFunc(int binaryNum)
{
  int octalNum = 0, decNum = 0, i = 0;

  while (binaryNum != 0)
  {
    decNum += (binaryNum % 10) *pow(2, i);
    ++i;
    binaryNum /= 10;
  }

  i = 1;

  while (decNum != 0)
  {
    octalNum += (decNum % 8) *i;
    decNum = decNum / 8;
    i *= 10;
  }

  return octalNum;
}

int main()
{
  int binaryNum;

  printf("Enter a binary number: ");
  scanf("%d", &binaryNum);

  printf("Octal Equivalent Value: %d", conversionFunc(binaryNum));

  return 0;
}

Output:

Enter a binary number: 101001
Octal Equivalent Value: 51

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