菲波纳奇数字

using System;
using System.Collections.Generic;

namespace ConsoleApplication3
{
    class Program
    {
        private static List<int> resultList = new List<int>() { 0, 1 };
        static void Main(string[] args)
        {
            int num = 89;
            //给出一个数，使用递归计算出该数前的菲波纳奇数字序列，并判断是否是菲波纳奇数字
            try
            {
                TestMethod(num, resultList.Count - 1);
                foreach (int item in resultList)
                {
                    Console.Write(item + "\t");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            Console.ReadLine();
        }

        static void TestMethod(int num, int index)
        {
            if (null != resultList && resultList.Count >= 2)
            {
                if (num == 0)
                    return;

                if (index > 0 && index <= resultList.Count)
                {
                    int tmpSum = resultList[index - 1] + resultList[index];
                    if (tmpSum < num)
                    {
                        resultList.Add(tmpSum);
                        TestMethod(num, resultList.Count - 1);
                    }
                    else if (tmpSum == num)
                        resultList.Add(tmpSum);
                    else
                        throw new Exception("该数字不是菲波纳奇数字");
                }
            }
        }
    }
}