Rot13 in C#

Published on 30 December 2018 (Updated: 06 April 2019)

Welcome to the Rot13 in C# page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

using System;
using System.Collections.Generic;
using System.Linq;

namespace SamplePrograms
    public class Rot13
        static List<char> Lowers = "abcdefghijklmnopqrstuvwxyz".ToCharArray().ToList();
        static List<char> Uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray().ToList();

        public static string Encrypt(string str) =>
            string.Join("", str.ToCharArray().Select(c => Encrypt(c)));

        public static Char Encrypt(char c)
            List<char> ltrs;
            if (char.IsUpper(c))
                ltrs = Uppers;
            else if (char.IsLower(c))
                ltrs = Lowers;
                return c;

            var newIndex = (ltrs.IndexOf(c) + 13) % 26;
            return ltrs[newIndex];


        public static void ExitWithError()
            Console.WriteLine("Usage: please provide a string to encrypt");

        public static void Main(string[] args)
                var str = args[0];
                if (String.IsNullOrEmpty(str))
                var result = Encrypt(str);

Rot13 in C# was written by:

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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