Encrypt a text file

Create a C# program that makes a copy of a text file but encrypted.

Add the characters of each letter 13 times to encrypt the contents of the text file.

Input

Output

Solution

using System.IO;
public class FileEncrypter
{
    public static void Main(string[] args)
    {
        string inputFileName = "input.txt";
        string outputFileName = "output.txt";

        string contents = File.ReadAllText(inputFileName);

        string cipher = string.Empty;
        byte key = 13;
        foreach (char letter in contents)
        {
            cipher += (char)(letter + key);
        }

        File.WriteAllText(outputFileName, cipher);
    }
}