**Description**

**Get a binary number as the input from the user and give the corresponding octal number as the output.**

**Input**

**1000**

**Output**

**10**

**C Program**

**#include<stdio.h>**

**#include<math.h>**

**void BOConvert(long long num)**

**{**

** int octal = 0, count = 1, i = 0, pos = 0;**

** int octalArr[32] = {0};**

** while(num != 0)**

** {**

** int digit = num % 10;**

** octal += digit * pow(2, i);**

** i++;**

** num /= 10;**

** octalArr[pos] = octal;**

** if(count % 3 == 0)**

** {**

** octal = 0;**

** i = 0;**

** pos++;**

** }**

** count++;**

** }**

** for (int j = pos; j >= 0; j--)**

** printf("%d",octalArr[j]);**

**}**

**int main()**

**{**

** long long binary;**

** printf("Enter binary number: ");**

** scanf("%lld", &binary);**

** BOConvert(binary);**

** return 0;**

**}**

**C++ Program**

**#include <iostream>**

**#include<math.h>**

**using namespace std;**

** int BOConvert(long bin)**

** {**

** int oct = 0, dec = 0, i = 0,rem;**

** while(bin != 0)**

** {**

** rem = bin % 10;**

** int res = rem * pow(2,i);**

** dec += res;**

** i++;**

** bin/=10;**

** }**

** i = 1;**

** while (dec != 0)**

** {**

** rem = dec % 8;**

** oct += rem * i;**

** dec /= 8;**

** i *= 10;**

** }**

** return oct;**

** }**

** int main()**

** {**

** long binary;**

** cout << "Enter a binary number: ";**

** cin >> binary;**

** int octal=BOConvert(binary);**

** cout << octal;**

** return 0;**

** }**

**Java**

**import java.util.Scanner;**

**public class Main **

**{**

**public static void main(String args[])**

**{**

**Scanner sc = new Scanner(System.in); **

**System.out.print("Enter a binary number : ");**

**int bin = sc.nextInt();**

**int dec = 0; **

**int n = 0;**

**while(bin > 0)**

**{**

**int temp = bin%10; **

**dec += temp*Math.pow(2, n); **

**bin = bin/10; **

**n++; **

**}**

**int oct[] = new int[20];**

**int i = 0;**

**while(dec > 0)**

**{**

**int r = dec % 8;**

**oct[i++] = r;**

**dec = dec / 8;**

**}**

**for(int j = i-1 ; j >= 0 ; j--)**

**System.out.print(oct[j]); **

**}**

**}**

**Python**

**bin = int(input("Enter the binary number: "))**

**octal = 0**

**octalnum = []**

**i = 0**

**mul = 1**

**c = 1**

**while bin!=0:**

** rem = bin % 10**

** octal = octal + (rem * mul)**

** if c%3==0:**

** octalnum.insert(i, octal)**

** mul = 1**

** octal = 0**

** c = 1**

** i = i+1**

** else:**

** mul = mul*2**

** c = c+1**

** bin = int(bin / 10)**

**if c!=1:**

** octalnum.insert(i, octal)**

**#print("\nEquivalent Octal Value = ", end="")**

**while i>=0:**

** print(str(octalnum[i]), end="")**

** i = i-1**

**print()**