program to convert binary no. into octal number system

we have two methods for this conversion.
either we can convert binary to decimal and then decimal to octal
or we can directly convert into octal using 3 bits system.


//program to convert binary no. into octal number system

#include<stdio.h>
#include<conio.h>

void main()

{

   

    long int binary_Number,octalNumber=0,j=1,remainder;

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

    scanf("%ld",&binary_Number);

    while(binary_Number!=0)
{

         remainder=binary_Number%10;

        octalNumber=octalNumber+remainder*j;

        j=j*2;

        binary_Number=binary_Number/10;

   }

    printf("Equivalent octal value: %lo",octalNumber);

    getch();

}

logics in mind:-

->we have to input a binary number, say 111
->we make group of 3 bits from right side, and for this, we use 

octalNumber=octalNumber+remainder*j;

        j=j*2;