pNacho

nachos.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;
using System.Threading;


namespace Fibonacho
{
    class Program
    {
        static bool found;
        static void Main(string[] args)
        {
            Console.Write($"Please enter the length of the Fibonacci Number: ");
            var länge = Convert.ToInt32(Console.ReadLine());
            Fibonacho(länge);
        }

        static void Fibonacho(int lenghtx)
        {
            BigInteger vorletzte = 0;
            BigInteger letzte = 1;
            BigInteger index = 2;

            Console.WriteLine("Counting..");

            while (!found)
            {
                BigInteger thisnum = vorletzte + letzte;
                vorletzte = letzte;
                letzte = thisnum;
                int length = thisnum.ToString().Length;            
                if (length == lenghtx)
                {
                    found = true;
                    Console.WriteLine($"Found: {thisnum} - Index: {index} - Length: {length}");
                }
                index++;
            }

            Thread.Sleep(TimeSpan.FromSeconds(5));

            Console.Read();
        }
    }
}