# C Program to Convert Binary to Octal

Write a C program to convert binary to octal using a while loop. In this c example, the first while loop converts binary two decimal and the second loop converts a decimal to octal.

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

int main()
{
int i, octal = 0, decimal = 0;
long binary;

printf("Enter the Binary Number = ");
scanf("%ld", &binary);

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

i = 1;
while(decimal != 0)
{
octal = octal + (decimal % 8) * i;
decimal = decimal / 8;
i = i * 10;
}
printf("The octal Value = %d\n", octal);
}```
``````Enter the Binary Number = 10101011
The octal Value = 253

Enter the Binary Number = 10101
The octal Value = 25``````

This c program converts a binary number to octal using the for loop.

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

int main()
{
int i, remainder, octal = 0, decimal = 0;
long binary;

printf("Enter the Binary Number = ");
scanf("%ld", &binary);

for(i = 1; binary != 0; i = i * 2, binary = binary / 10)
{
remainder = binary % 10;
decimal = decimal + remainder * i;
}

for(i = 1; decimal != 0; i = i * 10)
{
octal = octal + (decimal % 8) * i;
decimal = decimal / 8;
}
printf("\nThe octal Value = %d\n", octal);
}```

In this c example, the binaryTooctal function accepts the binary value, converts it to the octal number, and returns the same.

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

int binaryTooctal(long binary)
{
int octal = 0, i, decimal = 0;

for(i = 0; binary != 0; i++)
{
decimal = decimal + (binary % 10) * pow(2, i);
binary = binary/10;
}
for(i = 1; decimal != 0; i = i * 10)
{
octal = octal + (decimal % 8) * i;
decimal = decimal / 8;
}
return octal;
}

int main()
{
long binary;

printf("Enter the Binary Number = ");
scanf("%ld", &binary);

printf("The octal Value = %d\n", binaryTooctal(binary));

return 0;
}```
``````Enter the Binary Number = 11011011
The octal Value = 333

Enter the Binary Number = 1011
The octal Value = 13``````