namespace Fibonacci
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Would you like to know which Fibonacci Numbers：");
            int number = Convert.ToInt32(Console.ReadLine());
            //
            Function obj = new Function();
            Console.WriteLine();
            Console.Write("The {0} Fibonacci number is：{1}", number, obj.Fibonacci(number));
            //
            Console.WriteLine();
            Function obj2 = new Function(number);
            Console.Write("The {0} Fibonacci number is：{1}", number, obj2.BottomUpNotRecursion(number));
            //
            Console.WriteLine();
            Console.Write("The {0} Fibonacci number is：{1}", number, obj2.TopDownRecursion(number));
            Console.ReadKey();

        }
    }
}

namespace Fibonacci
{
    class Function
    {
        private int[] array;

        public Function()
        {

        }

        ///
        /// Function
        ///
        ///
        public Function(int length)
        {
            if (length > 0)
            {
                array = new int[length + 1];
                array[0] = 1;
                array[1] = 1;
            }
            if (length == 0)
            {
                array = new int[1];
                array[0] = 1;
            }
        }

        ///
        /// Fibonacci数列定义为：
        ///             无穷数列1，1，2，3，5，8，13，21，34，55，……
        ///        ┌ 1             n=0    
        ///   F(n)=│ 1             n=1
        ///        └ F(n-1)+F(n-2) n>1
        ///
        /// 第几个斐波那契数
        ///
        public int Fibonacci(int number)
        {
            if (number