//BULALACAO, JULIA MARGARETTE 

//CRUZ, SEBASTIAN ANDRE

//CCP 1103 - ITBC

//FIBONACCI FACTORIAL

​

using System;

public class FibonacciFactorial

{

    public static int Fibonacci(int n)

            {

                int fibonacciNumber = n;

                int i = 0;

                int x = 1;

                for (int j = 0; j < n; j++)

                {

                    int temp = i;

                    i = x;

                    x = temp + x;

                }

                return i;

            }

            public static int Factorial (int n) {

                int factorialNum = 1;

                for (int x = 1; x <= n; x++)

                {

                    factorialNum = factorialNum * x;

                }

            return factorialNum;

        }

​

       public static void Main()

        {

            int number;

            string inputNumber;

            int fibonacciFactorial = 0;

            int frozenNumber = 0;

            int answer = 0;

            Console.WriteLine("Fibonacci Factorial");

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

            inputNumber = Console.ReadLine();

            if (Int32.TryParse(inputNumber, out number)== true)

            {

                if (number <= 0 )

                {

                    Console.WriteLine("Zero or negative input is not allowed.");

                }

                else if(number >= 7){

                    Console.WriteLine("you can only input 1 to 6");

                }

                else

                {

                    for (int x = 1; x <= number; x++)

                    {

                        fibonacciFactorial = fibonacciFactorial + Factorial(Fibonacci(x));

                    }

                     for (int j = 1; j <= number; j++)

                        {

                            if (j == 1)

                            {         

                                frozenNumber += 1;

                            }

                            else

                            {

                                frozenNumber += answer;

                                answer = frozenNumber - answer;

                            }

                        }

                        string val = string.Format("{0:#,#0}",fibonacciFactorial);

                        Console.WriteLine("The fibonacci factorial sum of: {0:#,#0}", frozenNumber + " is " + val);

                }

            }

            else

            {

                Console.WriteLine("Invalid Input. Please Enter a numeric value.");

            }

       }

}

​