/*
 * C# Program to Find Multiplication of two Binary Numbers
 */
using System;
class program
{
    public static void Main()
    {
        int binary1, binary2, multiply = 0;
        int digit, factor = 1;
        prog pg = new prog();
        Console.WriteLine("Enter the first binary number: ");
        binary1 = int.Parse(Console.ReadLine());
        Console.WriteLine("Enter the second binary number: ");
        binary2 = int.Parse(Console.ReadLine());
        while (binary2 != 0)
            {
                digit =  binary2 % 10;
                if (digit == 1)
                    {
                        binary1 = binary1 * factor;
                        multiply = pg.binaryproduct(binary1, multiply);
                    }
                else
                    {
                        binary1 = binary1 * factor;
                        binary2 = binary2 / 10;
                        factor = 10;
                    }
                Console.WriteLine("Product of two binary numbers: {0}", multiply);
                Console.ReadLine();
            }
    }
    class prog
    {
        public int binaryproduct(int binary1, int binary2)
        {
            int i = 0, remainder = 0;
            int[] sum = new int[20];
            int binaryprod = 0;
            while (binary1 != 0 || binary2 != 0)
                {
                    sum[i++] =(binary1 % 10 + binary2 % 10 + remainder) % 2;
                    remainder =(binary1 % 10 + binary2 % 10 + remainder) / 2;
                    binary1 = binary1 / 10;
                    binary2 = binary2 / 10;
                }
            if (remainder != 0)
                sum[i++] = remainder;
            --i;
            while (i >= 0)
                binaryprod = binaryprod * 10 + sum[i--];
            return binaryprod;
        }
    }

    /*
    /*

    Enter the first binary number : 1010
    Enter the second binary number : 1011
    Product of two binary numbers : 1101110