Rot13 in Mathematica

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

Current Solution

(* Code *)

(* The actual rotation operating on Mathematica strings: *)

rot13 = s \[Function] StringJoin @@ Function[{c},
      FromCharacterCode @
       Piecewise[(* operate piecewise on the domain of ASCII character codes *)
        Append[{
            Mod[c + 13, 26, First@ToCharacterCode[StringTake[#, 1]]],
            Between[c, ToCharacterCode[#]]} & /@
          {"az", "AZ"},(* specific character intervals to operate on *)
         {c, True}] (* default does nothing *)
        ]] /@ ToCharacterCode[s];

(* The outer function provides the 'user interface': *)

rot13Main = s \[Function]
   Catch[
    rot13[
     If[
      StringQ[s] \[And] \[Not] StringMatchQ[s, ""],
      s,
      Throw["Usage: please provide a string to encrypt"]]]];


(* Valid Tests *)

Print /@ rot13Main /@ {
    "the quick brown fox jumped over the lazy dog",
    "THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG",
    "The quick brown fox jumped. Was it over the lazy dog?"
    };


(* Invalid Tests *)

rot13Main[""]

Rot13 in Mathematica was written by:

• Ben Hekster

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

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

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