C# has a string encryption problem, please enlighten me

murongshijia

If there is a program to encrypt a string, the first character of the encrypted string is the last character of the original string, and each other character is the value of the previous character in the corresponding original character plus 3. For example, "WELCOME ", the character at the end is "E", "welcome" is added 3 in turn to become "zhofrp", and the result of encryption is "zhofrp".

摩羯可乐

You can do this, make a 26-letter array, then save your string as an array, and then compare it with the 26-letter string. If you find the W character, then move to the +3 position, and then replace it, try test

andyleelee

Isn't the first character the last character in the string? It should be Ehofrp after WELCOME encryption.

accers

using System;

class Sample
{
public static void Main()
{
string input;
string output=null;
input = Console.ReadLine();
output += input[input.Length-1].ToString();
for (int i = 0; i <input.Length-1; i++)
{
output += ((char)(input[i] + 3)).ToString();
}
Console.WriteLine(output);
}
}

accers

test
welcome
result
ezhofrp

right?
And what do you do if it is z? Is it z+3 or (z+3)%26=a?
Your question is not clear
Can only do this

123ffff

Rotor encryption after character shift