using System;

public class Program

{

    public static void Main()

    {

        int num = 123456789;

        int digit = 3;

        if(NumberContainsDigit(num, digit))

        {

            Console.WriteLine($"{num} contiene {digit}");

        }

        else

        {

            Console.WriteLine($"{num} no contiene {digit}");

        }

    }

    private static bool NumberContainsDigit(int number, int digit)

    {

        while(number > 0) 

        {

            var currentDigit = number % 10;

            if(currentDigit % 10 == digit)

            {

                return true;

            }

            number = number / 10;

        }

        return false;

    }

}