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 CaesarArithmetic
{
public partial class Frm_Main : Form
{
int iShifting = 5;//默認偏移5
public Frm_Main()
{
InitializeComponent();
}
//獲取字符的ASCII碼
public int AscII(string str)
{
byte[] array = new byte[1];//創建字節數組
array = System.Text.Encoding.ASCII.GetBytes(str);//爲字節數組賦值
int asciicode = (short)(array[0]);//獲取字節數組的第一項
return asciicode;//返回字節數組的第一項
}
public string Caesar(string str)//凱撒加密算法的實現
{
char[] c = str.ToCharArray();//創建字符數組
string strCaesar = "";//定義一個變量,用來存儲加密後的字符串
for (int i = 0; i < str.Length; i++)//遍歷字符串中的每一個字符串
{
string ins = c[i].ToString();//記錄遍歷到的字符
int iIns = AscII(ins);
string outs = "";//定義一個變量,用來記錄加密後的字符串
bool isChar = "0123456789abcdefghijklmnopqrstuvwxyz".Contains(ins.ToLower());//判斷指定的字符串中是否包含遍歷到的字符
bool isToUpperChar = isChar && (ins.ToUpper() == ins);//判斷遍歷到的字符是否是大寫
ins = ins.ToLower();//將遍歷到的字符轉換爲小寫
if (isChar)//判斷指定的字符串中是否包含遍歷到的字符
{
Console.WriteLine("ins = {0}, a = {1}, z={2},AscII(ins)={3} ", ins, AscII("a"), AscII("z"), AscII(ins));
int offset = (AscII(ins) + iShifting - AscII("a")) % (AscII("z") - AscII("a") + 1);//獲取字符的ASCII碼
Console.WriteLine("({0} + 5 - 97 ) % (122 - 97 + 1) ", AscII(ins) );
Console.WriteLine("offset={0}",offset);
outs = Convert.ToChar(offset + AscII("a")).ToString();//轉換爲字符並記錄
if (isToUpperChar)//判斷是否大寫
{
outs = outs.ToUpper();//全部轉換爲大寫
}
}
else
{
outs = ins;//記錄遍歷的字符
}
strCaesar += outs;//添加到加密字符串中
}
return strCaesar;//返回加密後的字符串
}
private void button1_Click(object sender, EventArgs e)
{
string P_str_Code = textBox1.Text;//記錄要加密的密碼
textBox2.Text = Caesar(P_str_Code);//顯示加密後的字符串
}
private void button2_Click(object sender, EventArgs e)
{
string P_str_Code = textBox2.Text;//記錄要解密的密碼
textBox2.Text = Caesar2(P_str_Code);//顯示解密後的字符串
}
public string Caesar2(string str)//凱撒加密算法的實現
{
char[] c = str.ToCharArray();//創建字符數組
string strCaesar = "";//定義一個變量,用來存儲加密後的字符串
for (int i = 0; i < str.Length; i++)//遍歷字符串中的每一個字符串
{
string ins = c[i].ToString();//記錄遍歷到的字符
string outs = "";//定義一個變量,用來記錄加密後的字符串
bool isChar = "0123456789abcdefghijklmnopqrstuvwxyz".Contains(ins.ToLower());//判斷指定的字符串中是否包含遍歷到的字符
bool isToUpperChar = isChar && (ins.ToUpper() == ins);//判斷遍歷到的字符是否是大寫
ins = ins.ToLower();//將遍歷到的字符轉換爲小寫
if (isChar)//判斷指定的字符串中是否包含遍歷到的字符
{
int iIns = AscII(ins);
Console.WriteLine("ins = {0}, a = {1}, z={2} ", iIns, AscII("a"), AscII("z"));
//int offset = (AscII(ins) + 5 - AscII("a")) % (AscII("z") - AscII("a") + 1);//獲取字符的ASCII碼
//int offset = (AscII(ins) + 5 - AscII("a")) % (AscII("z") - AscII("a") + 1);//獲取字符的ASCII碼
int offset = (AscII("z") + iShifting - AscII(ins)) % (AscII("z") - AscII("a") + 1);
Console.WriteLine("offset = {0} ", offset);
//outs = Convert.ToChar(offset + AscII("a")).ToString();//轉換爲字符並記錄
outs = Convert.ToChar(AscII("z") - offset).ToString();//轉換爲字符並記錄
if (isToUpperChar)//判斷是否大寫
{
outs = outs.ToUpper();//全部轉換爲大寫
}
Console.WriteLine("outs = {0}", outs);
}
else
{
outs = ins;//記錄遍歷的字符
}
strCaesar += outs;//添加到加密字符串中
}
return strCaesar;//返回加密後的字符串
}
}
}
凱撒密碼,凱撒加密解密.
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