//LASTNAME, FIRSTNAME MIDDLE INITIAL (Student #1)

//LASTNAME, FIRSTNAME MIDDLE INITIAL (Student #2)

//CCP 1103 - SECTION

//FIBONACCI FACTORIAL SUM

​

​

using System;

namespace FactorialFibo

{

        public class Program

        {

            public static void Main(string[] args)

            {

                string inputStr;

                int inputNumber;

                int newNumber;

                int firstNumber = 0;

                int secNumber = 1;

                int factorial = 1;

                int totalFactorial = 0;

                int i = 1;

                bool invalid = false; 

​

                int[] fiboArr = new int[7];

                Console.WriteLine("Fibonacci Factorial Sum");

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

                inputStr = Console.ReadLine();

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

                {

                    if (inputNumber <= 0)

                    {

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

                        invalid = true;

                    }

                    else if (inputNumber > 6)

                    {

                        Console.WriteLine("Numbers greater than 6 is not allowed.");

                        invalid = true;

                        inputNumber = 0; 

                    }

                    else

                    {

                        while (i <= inputNumber)

                        {

​

                            newNumber = firstNumber + secNumber;

                            firstNumber = secNumber;

                            secNumber = newNumber;

                            fiboArr[i] = firstNumber;

                            i++;

                        }

                    }

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

                    {

                        for (int x = 1; x <= fiboArr[j + 1]; x++)

                        {

                            factorial *= x;

                        }

                        totalFactorial += factorial;

                        factorial = 1;

                    }

                    if (invalid == false)

                    {

                    Console.WriteLine("The Fibonacci Factorial sum of {0} is {1:#,0}.", inputNumber, totalFactorial);

                    }

                }

                else

                {

                    Console.WriteLine("Invalid input.");

                }

            }

        }

    }

​

​

​