# Convert Binary to Octal in C

In this source code example, we will write a code to binary value to octal number in the C programming language.

# Convert Binary to Octal in C

In this C program, we will take input from the User or console and print the result to the output:
``````// Binary number to octal number conversion
#include <stdio.h>

// Function that returns the last three digits
int three_digits(int n)
{
int r, d = 0, p = 1;

for (int i = 0; i < 3; i++)
{
r = n % 10;
d += r * p;
p *= 10;
n /= 10;
}
return d;
}

int main(void)
{
int binary_num, d = 0, base = 1, remainder, td, res = 0, ord = 1;

printf("Enter the binary number: ");
scanf("%d", &binary_num);

while (binary_num > 0)
{
if (binary_num >
111)  // Checking if binary number is greater than three digits
td = three_digits(binary_num);

else
td = binary_num;

binary_num /= 1000;

d = 0, base = 1;

// Converting the last three digits to decimal
while (td > 0)
{
remainder = td % 10;
td /= 10;
d += (base * remainder);
base *= 2;
}

res += d * ord;  // Calculating the octal value
ord *= 10;
}

printf("\nOctal equivalent is: %d", res);
return 0;
}

``````

Output:

``````Enter the binary number: 1001

Octal equivalent is: 11``````