递归求阶乘

using System;

class Factor
{
 public static void Main()
 {
  for(int i=1; i<=10; i++)
   Console.WriteLine("{0} 的阶乘是 {1}",i, Factorial(i));
 }
 public static long Factorial(long n)
 {
  if(n == 1)
   return 1;
  else
   return n * Factorial(n-1);
 }
}