Golden Ratio Approximation, C#

Golden Ratio Approximation

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            double error = 0.00001; //Set to desired error
            double goldenRatio = (1 + Math.Sqrt(5.0)) / 2;
            double div = 1;

List<int> fib = new List<int>();
            fib.Add(1); fib.Add(1);
            
            do
            {
                fib.Add(AddFibTerm(fib[fib.Count - 1], fib[fib.Count - 2]));

int n2 = fib.Count - 1;
                int n1 = fib.Count - 2;

div = (double)fib[n2]/(double)fib[n1];
            } while (Math.Abs(goldenRatio - div) >= error);

Console.WriteLine(fib[fib.Count - 2] + ", " + fib[fib.Count - 1] + " -> " + (double)fib[fib.Count - 1]/(double)fib[fib.Count - 2]);
            Console.WriteLine();
            Console.WriteLine("Golden Ratio: " + goldenRatio);
            Console.WriteLine("Approx.: " + div);
            Console.WriteLine("Fib Terms: " + "F{" + (fib.Count-1) + "}: " + fib[fib.Count - 2] + ", " + "F{" + (fib.Count) + "}: " + fib[fib.Count - 1]);
        }
        //Lazy method
        public static int AddFibTerm(int n1, int n2)
        {
            Console.WriteLine(n2 + ", " + n1 + " -> " + (double)n1/(double)n2);
            return n1 + n2;
        }
    }
}


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