Write a program in C# Sharp to convert a binary number into a decimal number without using array, function and while loop

using System;  
public class Exercise42
{  
    public static void Main()
{       int n1, n,p=1;
	int dec=0,i=1,j,d;
	Console.Write("\n\n");
    Console.Write("Convert a binary to decimal using for loop and without using array:\n");
    Console.Write("---------------------------------------------------------------------");
    Console.Write("\n\n");	

	Console.Write("Input a binary number :");
   n = Convert.ToInt32(Console.ReadLine());	
	n1=n;
	for (j=n;j>0;j=j/10)
	{  
          d = j % 10;
            if(i==1)
                  p*=1;
            else
                 p*=2;

	   dec=dec+(d*p);
	   i++;
	}
        Console.Write("\nThe Binary Number : {0}\nThe equivalent Decimal  Number : {1} \n\n",n1,dec);
  }
}