Simple C# program to calculate n-th element of Fibonacci sequence.

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

// © 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

namespace Fibonacci
{
    class Program
    {
        static void Main(string[] args)
        {
            int n;

            Console.Out.WriteLine("Enter a number: ");
            n = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Fibonacci of: {0} is equal to {1}", n, fibonacci(n));

            Console.ReadKey();
        }

        static int fibonacci(int n)
        {
            int fib = 0;
            int fibPrev1 = 1;
            int fibPrev2 = 0;

            for (int i = 2; i <= n; i++)
            {
                fib = fibPrev1 + fibPrev2;
                fibPrev2 = fibPrev1;
                fibPrev1 = fib;
            }

            return fib;
        }
    }
}

 



C# Fibonacci
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