C#.Net Logical Programs For Interview System Test

//febonacci Series Logic Result:0,1,1,2,3,5,8,13,21...

            int i, count, f1 = 0, f2 = 1, f3 = 0;

            Console.Write("Enter the Limit : ");

            count = int.Parse(Console.ReadLine());

            Console.WriteLine(f1);

            Console.WriteLine(f2);

            for (i = 0; i <= count; i++)

            {

                f3 = f1 + f2;

                Console.WriteLine(f3);

                f1 = f2;

                f2 = f3;

            }

            Console.ReadLine();

  

//Check Weather Given string is palindrome or not

        static void Main(string[] args)

        {

            string s, revs = "";

            Console.WriteLine(" Enter string");

            s = Console.ReadLine();

            for (int i = s.Length - 1; i >= 0; i--) //String Reverse

            {

                revs += s[i].ToString();

            }

            if (revs == s) // Checking whether string is palindrome or not

            {

                Console.WriteLine("String is Palindrome \n Entered String Was {0} and reverse string is {1}", s, revs);

            }

            else

            {

                Console.WriteLine("String is not Palindrome \n Entered String Was {0} and reverse string is {1}", s, revs);

            }

            Console.ReadKey();

        }

            //PrimeNumber Logic  Result  Divided by It self Only

            public static void Main()

            {

                Console.Write("Enter a Number : ");

                int num;

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

                int k;

                k = 0;

                for (int i = 1; i <= num; i++)

                {

                    if (num % i == 0)

                    {

                        k++;

                    }

                }

                if (k == 2)

                {

                    Console.WriteLine("Entered Number is a Prime Number and the     Largest Factor is {0}", num);

                }

                else

                {

                    Console.WriteLine("Not a Prime Number");

                }

                Console.ReadLine();

            }

//Factorial of Given Number 5!=5*4*3*2*1

              Console.WriteLine("enter n value");

              int num = Convert.ToInt32(Console.ReadLine());

              int k = num;

              int result = 1;

          while (num > 0)

          {

              result = result * num;

              num--;

          }

       

            Console.WriteLine("factorial of"+k+" is"+result);