关于整数的一阶乘和二阶乘的算法

           界面：

 代码部分：

        C# Code:

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

 

程序主体：

 

namespace Factorial
{
    /**//// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void calculatorClick(object sender, RoutedEventArgs e)
        {
            try
            {
                
                string line = numInput.Text;
                uint number = uint.Parse(line);
               
                uint firstResult = Facorial.firstFactorial(number);
                firstFact.Text = firstResult.ToString();
                
            }
            catch (OverflowException oEx)
            {
                firstFact.Text = oEx.Message;
            }
            catch (FormatException fEx)
            {
                firstFact.Text = fEx.Message;
                secondFact.Text = fEx.Message;

            }

            try
            {

                string line = numInput.Text;
                uint number = uint.Parse(line);               
                uint secondResult = Facorial.secondFactorial(number);
                secondFact.Text = secondResult.ToString();
            }
            catch (OverflowException oEx)
            {
                secondFact.Text = oEx.Message;
            }
         
            catch (FormatException fEx)
            {
                firstFact.Text = fEx.Message;
                secondFact.Text = fEx.Message;

            }
        }

        private void quitClick(object sender, RoutedEventArgs e)
        {
            this.Close();

        }
        

    }
   class Facorial
    {
       public static uint firstFactorial(uint n)
        {
            checked
            {
                uint sum = 1;

                for (uint i = 1; i <= n; i++)
                {
                    sum *= i;                    
                }
                return sum;
            }
           
            
            
        }

     
       public static uint secondFactorial(uint n)
        {
            checked
            {

                uint sum = 1;
                for (uint i = 1; i <= n; i++)
                {
                    if (i % 2 == n % 2)
                    {
                        sum *= i;                        
                    }
                    else
                    {
                        sum *= 1;
                    }

                }
                return sum;
            }
          
          
        }
      
    }
}