C # calculation 10! The value

Source: Internet
Author: User

Common algorithms (C #): Calculate 10! The value.

using System;
using System.Collections.Generic;
using System.Text;
namespace ExFactorial
{
  class Factorial
  {
    public double factorial(int num)
    {
      switch (num)
      {
        case 1:
          return 1;
        default :
          return num * factorial(num - 1);
      }
    }
    static void Main(string[] args)
    {
      Console.WriteLine("输入一个整数:");
      int num=Convert.ToInt32 (Console.ReadLine());
      Factorial f = new Factorial();
      Console.WriteLine("{0}!的值为{1}", num, f.factorial(num));
    }
  }
}

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