Fibonacci

using System;
using System.Collections.Generic;

namespace quickstart {
    class Program {
      static void Main(string[] args) {
           WorkingWithStrings();

            var fibonacciNumbers = new List<int> {1, 1};
            while (fibonacciNumbers.Count < 20) {
            var previous = fibonacciNumbers[fibonacciNumbers.Count - 1];
            var previous2 = fibonacciNumbers[fibonacciNumbers.Count - 2];
                fibonacciNumbers.Add(previous + previous2);
            }
                foreach (var item in fibonacciNumbers)
                     Console.WriteLine(item);
        }
        public static void WorkingWithStrings() {
            var names = new List<string>  {"Wheelfox", "Roadhog", "Junkrat"};
                foreach (var name in names) {
                     Console.WriteLine($"Hello, {name.ToUpper()}!");
            }
                     Console.WriteLine();
                names.Add ("Enginehawk");
                names.Add ("Tirebear");
                names.Remove ("Wheelfox");
                foreach (var name in names) {
                     Console.WriteLine($"Hello, {name.ToUpper()}!");
                }
                     Console.WriteLine($"My name is {names[0]}!");
                     Console.WriteLine($"I've added {names[2]} and {names[3]} to the list!");
                     Console.WriteLine($"The list has {names.Count} people in it.");
            var index = names.IndexOf("Junkrat");
                     Console.WriteLine($"The name {names[index]} is at index {index}.");
            var notFound = names.IndexOf("Not Found");
                     Console.WriteLine($"When an item is not found, IndexOf returns {notFound}.");

                names.Sort();
                foreach (var name in names) {
                     Console.WriteLine($"Hello, {name.ToUpper()}!");
            }

        }
    }
}