/*
? Filename: encrypt_string.cs
? Author?: zhanghua
? Date??: 2005-08-11
? Fuction : input a strig? and encrypt a string
??????????? 加密后的字符串的第一個(gè)字符是原先字符串的最后一個(gè)字符，
??????????? 其余的每一個(gè)字符是對(duì)應(yīng)的原字符串中的前一個(gè)字符的值加
??????????? 上3。
??????????? example： welcome -> ezhofrp
????????
*/
using System;

class Test
{
?public static void Main()
?{
??string strInput, strOutput;
??
??Console.WriteLine("please input a string to encrypt: /n");
??strInput=Console.ReadLine();

??
??Console.WriteLine(" your input string is : {0}/n", strInput);
?? //Encrypt(strInput);
??
??strOutput = Encrypt(strInput);
?
?? Console.WriteLine("strOutput is :{0}/n", strOutput);
?}
??
? private static string? Encrypt(string? strInput)
? {
???string strFont,? strEnd;
???string strOutput;
???char[] charFont;
???int i,len, intFont;
???
???len = strInput.Length;
???//Console.WriteLine(" strInput 's length is :{0} /n", len);
???strFont = strInput.Remove(len-1,1);?????????????????????????????????
???strEnd= strInput.Remove(0, len-1);?????????????????????????????????
????????????????????????????????
???//Console.WriteLine(" strFont is : {0} /n" , strFont);?????????????????????????????????
???//Console.WriteLine(" strEnd is : {0} /n" , strEnd);?????????????????????????????????
?????????????????????????????????
?? ??charFont = strFont.ToCharArray();?????????????????????????????????
???for(i=0; i<strFont.Length; i++)?????????????????????????????????
???{?????????????????????????????????
????intFont = (int)charFont[i] + 3;?????????????????????????????????
????//Console.WriteLine(" intFont is : {0} /n", intFont);?????????????????????????????????
?????????????????????????????????????
????charFont[i]= Convert.ToChar(intFont);? ?????????????????????????????????
????//Console.WriteLine("charFont[{0}] is : {1}/n", i, charFont[i]);?????????????????????????????????
???}
?? ??strFont = ""; //let strFont? null
???for (i=0; i<charFont.Length; i++)
???{
????? strFont += charFont[i];
????}?
? ???strOutput=strEnd + strFont;
? ???return strOutput;
???
??}
}

?

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