递归算法求阶乘

 1using System;
 2using System.Collections.Generic;
 3using System.Linq;
 4using System.Text;
 5
 6namespace ConsoleApplication12
 7{
 8    class factorial
 9    {
10        public int Factorial(int n)
11        { 
12           if(n<=1)
13           {
14              return 1; 
15           }//end if
16           else
17           {
18               return n*Factorial(n-1);
19           }//end else 
20        }//end Factorial()
21    }
22    class Program
23    {
24        static void Main(string[] args)
25        {
26            int n=0;
27            int result=0;
28            Console.Write("输入要计算阶乘的数字：");
29            n = Int32.Parse(Console.ReadLine());
30       
31            factorial fa = new factorial();
32            result = fa.Factorial(n);
33            Console.WriteLine("{0}!={1}",n,result);
34            Console.ReadLine();
35        }//end Main()
36    }//end class Program
37}//end namespace
38