using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace sinValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            //Variables
            int numbers1, numbers2, numbers3, numbers4, numbers5, numbers6, numbers7, numbers8, numbers9;
            int sin;
            bool valid;
            int sum;
            int product;
            double test;

			int numberOfValidation = 0;
            do{
            	numberOfValidation++;
            	Console.WriteLine( string.Format( "Validation #{0}", numberOfValidation ) );
                // Prompt for user input
                Console.WriteLine("\nEnter SIN: ");
                sin = Int32.Parse(Console.ReadLine());

                // spliting the SIN into 9 seperate digits in different variables, and then printing them.
                Console.WriteLine("The first digit is {0}", numbers1 = (sin / 100000000));
                Console.WriteLine("The second digit is {0}", numbers2 = (sin % 100000000 / 10000000));
                Console.WriteLine("The third digit is {0}", numbers3 = (sin % 10000000 / 1000000));
                Console.WriteLine("The fifth digit is {0}", numbers4 = (sin % 1000000 / 100000));
                Console.WriteLine("The sixth digit is {0}", numbers5 = (sin % 100000 / 10000));
                Console.WriteLine("The seventh digit is {0}", numbers6 =(sin % 10000 / 1000));
                Console.WriteLine("The eighth digit is {0}", numbers7 = (sin % 1000 / 100));
                Console.WriteLine("The ninth digit is {0}", numbers8 =(sin % 100 / 10));
                Console.WriteLine("The tenth digit is {0}", numbers9 = (sin % 10));

                // Beginning of validation 
                //obtaining product of the sin using provided multipliers

                product = ((numbers1 * 1) + (numbers2 * 2) + (numbers3 * 1) + (numbers4 * 2) + (numbers5 * 1) + (numbers6 * 2) + (numbers7 * 1) + (numbers8 * 2));
                Console.WriteLine("The product {0}", product);

                // using div and mod to get numbers for the sum of digits
                sum = (((numbers1 * 1)+ (numbers2 * 2) % 10) +((numbers2 * 2) / 10) + (numbers3 * 1) + ((numbers4 * 2)%10) + ((numbers4 * 2)/10) + (numbers5 * 1) + ((numbers6 * 2)%10)+((numbers6 * 2)/10) + (numbers7 * 1) + ((numbers8 * 2)%10) + ((numbers8 * 2)/10));

                //Test to see if sum % 10 subtracted by 10 will give final digit
                test = (10 -(sum % 10));
 
                valid = false;
                if (test > numbers9)
                {
                    if (test == numbers9)
                        valid = true;
                }

                Console.WriteLine("{0}", valid);

                valid = false;
                if (numbers9 > test && test < numbers9)
                {
                    valid = true;
                }

                Console.WriteLine("{0}", valid);
        	}while( !valid && numberOfValidation <= 2 );
        }
    }
}