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凯撒密码的实现


using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace CarsonPassword
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Solve_Click(object sender, EventArgs e)

        {

            //使用字符串的ToArray方法把输入的字符串转换为字符数组

            //java中使用的是ToCharArray方法      

            char[] s = InputPassword.Text.ToArray()

                for (int i = 0; i < s.Length; i++) {

                if ((s[i] >= 'A' && s[i] <= 'W') || (s[i] >= 'a' && s[i] <= 'w'))
                {
                    int t = (int)s[i] + 3;
                    char ss = (char)t;
                    textBox2.Text += ss.ToString();
                }
                else
                {
                    int t = (int)s[i] - 23;
                    char ss = (char)t;
                    textBox2.Text += ss.ToString();
                }
            }
        }

        private void Recover_Click(object sender, EventArgs e)
        {
            char[] s = InputPassword.Text.ToArray();
            for (int i = 0; i < s.Length; i++)
            {
                if ((s[i] >= 'D' && s[i] <= 'Z') || (s[i] >= 'd' && s[i] <= 'z'))
                {
                    int t = (int)s[i] - 3;
                    char ss = (char)t;
                    textBox2.Text += ss.ToString();
                }
                else
                {
                    int t = (int)s[i] + 23;
                    char ss = (char)t;
                    textBox2.Text += ss.ToString();
                }
            }
        }
    }
}

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