求特征数列(第n个数是第n-1个数和第n-2个数的和)的第X个数是多少

时间:2022-01-02 22:38:40

有这样一个数列,第n个数是第n-1个数和第n-2个数的和,求第x个数是多少?
编写函数:
        int Add(int a)
        {
            if (a == 1 || a == 2)
                return 1;
            else
                return (Add(a - 1) + Add(a - 2));
        }
第X数是 Add(x);
////////////////////////
Test Demo
///////////////////////
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            while(true)           
           {
                Console.WriteLine("please enter a number:");
                int temp = int.Parse(Console.ReadLine());
                if (temp == 0)
                {
                    Console.WriteLine("Press any key to exit...");
                    Console.Read();
                    return;
                }
                long result = Compute.Add(temp);
                Console.WriteLine("The result is:" + result);          
            }           
        }

    }
    public class Compute
    {
        public static long Add(int a)
        {
            if (a == 1 || a == 2)
                return 1;
            else
                return (Add(a - 1) + Add(a - 2));
        }
    }

}