C#用递归求阶乘 n！

C#用递归方式求阶乘

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 弟子规
{
    class Program
    {
        public static double recursion(int n)
        {
                return (n==1?1:n * recursion(n - 1));
        }
        static void Main(string[] args)
        {
            Console.Write(recursion(6));
        }
    }
}

(假设n为正整数)