using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("By Brandon Eduardo Cortes Correa");

        Console.WriteLine("");

             int n1, n5,p=1;

     int dec=0,i=1,j,d;

     int binno=0;

    Console.Write("\n\n");

    Console.Write("Convert Octal to Binary:\n");

    Console.Write("--------------------------");

    Console.Write("\n\n");   

​

​

    Console.Write("Input an octal number (using digit 0 - 7) :");

    n1 = Convert.ToInt32(Console.ReadLine());   

    n5=n1;

​

​

​

    for (j=n1;j>0;j=j/10)

    {  

          d = j % 10;

            if(i==1)

                  p=p*1;

            else

                 p=p*8;

​

       dec=dec+(d*p);

       i++;

    }

​

/*------------------------------------------------------------------------------*/

     i=1;

​

      for(j=dec;j>0;j=j/2)

       {

        binno=binno+(dec % 2)*i;

        i=i*10;

        dec=dec/2;

       }

        Console.Write("\nThe Octal Number : {0}\nThe equivalent Binary  Number : {1} \n\n",n5,binno);

}

}