Swap the Alphabet

Question 1

In this challenge, you will be "reversing" the alphabet or swapping a-z with z-a. This is commonly known as the Atbash cypher.

Because this transformation makes the output look like some foreign language, your code will need to be as short as possible.

Examples

abcdefghijklmnopqrstuvwxyz
zyxwvutsrqponmlkjihgfedcba
Programming Puzzles & Code Golf
Kiltiznnrmt Kfaaovh & Xlwv Tlou
Hello, World!
Svool, Dliow!

Specification

The input may contain multiple lines, and will be ASCII-only
No additional whitespace should be added to the output
Case must be preserved

Leaderboard

var QUESTION_ID=68504,OVERRIDE_USER=40695;function answersUrl(e){return"https://api.stackexchange.com/2.2/questions/"+QUESTION_ID+"/answers?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+ANSWER_FILTER}function commentUrl(e,s){return"https://api.stackexchange.com/2.2/answers/"+s.join(";")+"/comments?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+COMMENT_FILTER}function getAnswers(){jQuery.ajax({url:answersUrl(answer_page++),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){answers.push.apply(answers,e.items),answers_hash=[],answer_ids=[],e.items.forEach(function(e){e.comments=[];var s=+e.share_link.match(/\d+/);answer_ids.push(s),answers_hash[s]=e}),e.has_more||(more_answers=!1),comment_page=1,getComments()}})}function getComments(){jQuery.ajax({url:commentUrl(comment_page++,answer_ids),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){e.items.forEach(function(e){e.owner.user_id===OVERRIDE_USER&&answers_hash[e.post_id].comments.push(e)}),e.has_more?getComments():more_answers?getAnswers():process()}})}function getAuthorName(e){return e.owner.display_name}function process(){var e=[];answers.forEach(function(s){var r=s.body;s.comments.forEach(function(e){OVERRIDE_REG.test(e.body)&&(r="<h1>"+e.body.replace(OVERRIDE_REG,"")+"</h1>")});var a=r.match(SCORE_REG);a&&e.push({user:getAuthorName(s),size:+a[2],language:a[1],link:s.share_link})}),e.sort(function(e,s){var r=e.size,a=s.size;return r-a});var s={},r=1,a=null,n=1;e.forEach(function(e){e.size!=a&&(n=r),a=e.size,++r;var t=jQuery("#answer-template").html();t=t.replace("{{PLACE}}",n+".").replace("{{NAME}}",e.user).replace("{{LANGUAGE}}",e.language).replace("{{SIZE}}",e.size).replace("{{LINK}}",e.link),t=jQuery(t),jQuery("#answers").append(t);var o=e.language;/<a/.test(o)&&(o=jQuery(o).text()),s[o]=s[o]||{lang:e.language,user:e.user,size:e.size,link:e.link}});var t=[];for(var o in s)s.hasOwnProperty(o)&&t.push(s[o]);t.sort(function(e,s){return e.lang>s.lang?1:e.lang<s.lang?-1:0});for(var c=0;c<t.length;++c){var i=jQuery("#language-template").html(),o=t[c];i=i.replace("{{LANGUAGE}}",o.lang).replace("{{NAME}}",o.user).replace("{{SIZE}}",o.size).replace("{{LINK}}",o.link),i=jQuery(i),jQuery("#languages").append(i)}}var ANSWER_FILTER="!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe",COMMENT_FILTER="!)Q2B_A2kjfAiU78X(md6BoYk",answers=[],answers_hash,answer_ids,answer_page=1,more_answers=!0,comment_page;getAnswers();var SCORE_REG=/<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/,OVERRIDE_REG=/^Override\s*header:\s*/i;

body{text-align:left!important}#answer-list,#language-list{padding:10px;width:290px;float:left}table thead{font-weight:700}table td{padding:5px}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b"> <div id="answer-list"> <h2>Leaderboard</h2> <table class="answer-list"> <thead> <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr></thead> <tbody id="answers"> </tbody> </table> </div><div id="language-list"> <h2>Winners by Language</h2> <table class="language-list"> <thead> <tr><td>Language</td><td>User</td><td>Score</td></tr></thead> <tbody id="languages"> </tbody> </table> </div><table style="display: none"> <tbody id="answer-template"> <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody> </table> <table style="display: none"> <tbody id="language-template"> <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody> </table>

This is code-golf so shortest code in bytes wins

Question 2

+1 for the justification "Because this transformation makes the output look like some foreign language, your code will need to be as short as possible."

Question 3

Some Trivia: this is Atbash, a known cipher as old as the bible.

Question 4

"Because this transformation makes the output look like some foreign language, your code will need to be as short as possible." What kind of logic is that?? Because your description raises about as much question marks as if it was written in some foreign language your answer to this question should be in intelligible natural language and some verbosity is appreciated.

Question 5

Kiltiznnrmt Kfaaovh & Xlwv Tlou should be the new site for "Programming Trivials & Code Bowling"...

Question 6

Why don't you allow additional whitespace? That makes it impossible in some languages that always have a trailing newline. I can't see it adding anything to the challenge.

Question 7

C, 59 bytes

Sorry for bringing up C again, but I was a bit disappointed to see only C functions here. I was under the impression OP was looking for a usable product.

main(c){while(~(c=getchar()))putchar(isalpha(c)?c+4^31:c);}

Compiled on Ubuntu 14.04 with a simple:

cc swalpha.c

The resulting executable reads any number of lines from stdin, and writes the result to stdout.

Thanks to so many of the other posters for the XOR trick.

Question 8

This was the most extreme compact program that does something remarkably amazing like this! @Ruud Helderman this was extremely well done!

Question 9

Pyth, 8 bytes

XXzG)rG1

@xnor suggested this simpler approach on @FryAmTheEggman's Pyth answer, then I translated it to Pyth.

This uses the handy behavior of X (translate) when given only two arguments: it translates from the second argument to the reversed second argument. We do this first with the lowercase alphabet (G), and then with uppercased G.

Question 10

JavaScript (ES6), (削除) 69 (削除ここまで) 67 bytes

x=>x.replace(/[A-Z]/gi,c=>String.fromCharCode(c.charCodeAt()+4^31))

Uses the same strategy as my Japt answer:

x=>x.replace(/[A-Z]/gi,C=> // Replace each letter C with
 String.fromCharCode( // the character with char code
 C.charCodeAt()+4^31)) // the char code of C, plus 4, with the last 5 bits flipped.

Curse your incredibly long property names, JS...

Question 11

+1 for mentioning JS's excruciatingly long property names. My favorite is still the infamous document.getElementById

Question 12

@Cyoce Try document.getElementsByClassName or, on Firefox and Chrome, document.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC

Question 13

This seems to only be 66 bytes not 67

Question 14

It looks like you are missing a closing bracket on the end of the golfed code.

Question 15

@starbeamrainbowlabs Thanks! I wondered why I had miscounted...

Question 16

CJam, 17 bytes

I wanted to help GamrCorps golf his CJam solution, but the result ended up so different that I decided to make a separate answer.

q'[,_el^_W%32f^er

Try it online.

Explanation

q e# Read all input.
'[, e# Get a character range from the null byte up to and including "Z".
_el e# Duplicate and convert to lowercase.
^ e# Symmetric set difference. Due to the lowercase operation only letters will not
 e# appear in both sets, and so we get a string with all uppercase letters followed
 e# by all lowercase letters, i.e "ABC...XYZabc...xyz".
_W% e# Duplicate and reverse. Gives: "zyx...cbaZYX...CBA".
32f^ e# Take each character XOR 32 which swaps the case, so now we have:
 e# "ZYX...CBAzyx...cba"
er e# Transliterate: substitute each character in the first string with the correspoding
 e# character in the second string.

Question 17

Well, I'm glad you were trying to help! That is the solution that I was trying to make, I just couldn't figure out the XOR. Nice Job!

Question 18

SE's syntax highlighting hates esolangs.

Question 19

@Cyoce They probably don't have time; given how many languages are on this site. That said, CJam is probably one of the easier ones, as it's not self-modifying and has a pretty clear structure. I'd like to see them try to add syntax-highlighting to a self-modifying language like ///.

Question 20

@Challenger5 afaik, the syntax highlighting just uses Google's prettify, do support for various esolangs would have to be added there.

Question 21

Retina, (削除) 17 (削除ここまで) (削除) 14 (削除ここまで) 13 bytes

Code:

\T`w`_dZ-Az-a

Explanation:

\ # This suppresses the trailing linefeed
 T # Switches to transliterate mode
 `w # w is short for _0-9A-Za-z
 `_d # d is short for 0-9
 Z-Az-a # Z-Az-a

This does some magic stuff and completes the task.

Try it here.

Question 22

Lucky you that I recently added \. Unlucky you that I didn't get around to adding character classes for letters and reversed character classes yet.

Question 23

@MartinBüttner Very lucky indeed, that almost invalidated my answer :)

Question 24

For reference, as of Retina 0.7.2 you could do \T`lL`RlRL.

Question 25

Pyth, (削除) 10 (削除ここまで) 9

uXGr;H)2z

Thanks to Jakube for saving a byte with the new feature of ;!

Test Suite

A quick explanation: reduce starting with the input over the numbers 0 and 1. The operation to be performed is translate the lower case alphabet with either r...0 or r...1 which are the lower and upper functions from python, respectively, applied to it, and then reversed.

Question 26

9 bytes due to a new feature (not even a day old): uXGr;H)2z

Question 27

Can you add an explanation?

Question 28

Can't you use X with the alphabet and then with the capitalized alphabet?

Question 29

@xnor XXzG)rG1? That seems to work.

Question 30

Or, maybe do X on the lowercase and uppercase alphabets concatenated, then swap case? That's probably longer, actually.

Question 31

Julia, (削除) 74 (削除ここまで) (削除) 61 (削除ここまで) 47 bytes

s->replace(s,r"[a-z]"i,t->Char(31$Int(t[1])-4))

This is a lambda function that accepts a string and returns a string. To call it, assign it to a variable.

We match each letter using a regular expression and replace each letter with the ASCII character corresponding to 31 XOR the ASCII code for the letter, minus 4.

Question 32

Wow, this is very elegant. I get a deprecation warning for $ so you might want to update that to ⊻. Didn't know that you can use a function in replace.

Question 33

Python, 61 bytes

lambda x:''.join([c,chr(ord(c)+4^31)][c.isalpha()]for c in x)

An anonymous function. On letters, does the reversing operation on the bit representation by adding 4, then flipping the last five bits, similar to ETHproductions' Javascript answer.

Question 34

Just wrote the exact same thing haha

Question 35

C, (削除) 150 (削除ここまで) 129 Bytes

void rev(char*s){int i,t;for(i=0;i<strlen(s);i++){t=s[i]+25;t=t<116?180-t:244-t;isalpha(s[i])?printf("%c",t):printf("%c",s[i]);}}

This function just converts char to int and adds the appropriate offset to the int before printing. I know it's not the shortest but I didn't see a C implementation.

Example usage

#include<stdio.h>
#include<string.h>
#include<ctype.h>
void rev(char*s){int i,temp;for(i=0;i<strlen(s);i++){temp=s[i]+25;temp=temp<116?180-temp:244-temp;isalpha(s[i])?printf("%c",temp):printf("%c",s[i]);}}
int main(){
 char *s = "hello, there";
 rev(s);
 return 0;
}

UPDATE: shortened a variable name.

Question 36

Welcome to Programming Puzzles and Code Golf Stack Exchange! This is a very good approach. It could be golfed more by making all variables (including temp) exactly one character long.

Question 37

Ahh you are right! I will regolf this one

Question 38

Do you think you could have a go at my challenge? Analyse your Chair

Question 39

Yes it will work without the headers you just get a compiler warning @edc65 I figured since it compiles and runs it wouldn't be considered cheating but in real world use you should always include the headers.

Question 40

107 bytes: i,t;r(char*s){for(;i<strlen(s);i++){t=s[i]+25;t=t<116?180-t:244-t;isalpha(s[i])?putchar(t):putchar(s[i]);}}

Question 41

Japt, (削除) 23 (削除ここまで) 22 bytes

Ur"[A-Za-z]"_c +4^31 d

Try it online!

How it works

Ur"[A-Za-z]"_ // Take the input and replace each letter with:
 c +4 // Take its char code and add 4. This results in
 // the string "ABC...XYZabc...xyz"
 // becoming "EFG...\]^efg...|}~".
 ^31 // XOR the result by 31. This flips its last five 5 bits.
 // We now have "ZYX...CBAzyx...cba".
 d // Convert back from a char code.
 // Implicit: output last expression

Question 42

Nice idea (which I borrowed...) to use XOR for this

Question 43

C, 64

A void function that modify the string in place.

t(char*p){for(int c;c=*p;)*p++=c>64&c<91|c>96&c<123?(c^31)-4:c;}

Test: ideone

Question 44

c;t(char*p){for(;c=*p;)*p++=c>64&c<91|c>96&c<123?(c^31)-4:c;}

Question 45

@CoolGuy right, but I don't like the global inside a function... it's just me

Question 46

Isn't this 64 bytes?

Question 47

R, (削除) 69 (削除ここまで) 61 bytes

Thanks to @Giuseppe for shaving off some extra bytes:

function(s)cat(chartr("a-zA-Z",intToUtf8(c(122:97,90:65)),s))

Previous version:

function(s)cat(chartr("a-zA-Z",rawToChar(as.raw(c(122:97,90:65))),s))

This is an anonymous function. Usage:

> f=function(s)cat(chartr("a-zA-Z",rawToChar(as.raw(c(122:97,90:65))),s))
> f("Hello, World!")
Svool, Dliow!
> f("Programming Puzzles & Code Golf")
Kiltiznnrmt Kfaaovh & Xlwv Tlou
> f("This is
+ a multiline
+ example.")
Gsrh rh
z nfogrormv
vcznkov.

Question 48

intToUtf8(c(122:97,90:65)) instead of the raw conversions, and you can get rid of the cat as well. I'm making it a bit of a habit to come golf 1+ year old answers of yours...

Question 49

Ruby, 40 bytes

New solution: Stole that bit flipping magic from some of the other posts here:

->s{s.gsub(/[a-z]/i){($&.ord+4^31).chr}}

Ruby, (削除) 55 (削除ここまで) 46 bytes

->s{s.tr'a-zA-Z',[*?A..?Z,*?a..?z].reverse*''}

9 bytes off thanks to @manatwork

test run:

->s{s.gsub(/[a-z]/i){($&.ord+4^31).chr}}["Kiltiznnrmt Kfaaovh & Xlwv Tlou"]
=> "Programming Puzzles & Code Golf"

Question 50

Jolf, 15 bytes

~Ai+plpu+_pl_pu
~A I don't know what to call this, besides "dictionary replace"
 i the input
 +plpu previous dictionary: lower + upper alphabet
 +_p1_pu new dictionary: reversed lower + reversed upper

Test suite, or try it with your own input

Question 51

The word for this is "transliteration," FYI.

Question 52

ESMin 2, 12 chars / 26 bytes (non-competitive)

ïĪ(ᶐ+ɒ,ᶐᴙ+ɒᴙ

Try it here (Firefox only).

Added transliterate function after the challenge was posted.

Explanation

ïĪ(ᶐ+ɒ,ᶐᴙ+ɒᴙ // implicit: ï=input
ïĪ( // transliterate ï...
 ᶐ+ɒ, // from uppercase+lowercase alphabet...
 ᶐᴙ+ɒᴙ // ... to reversed uppercase+reversed lowercase alphabet
 // implicit output

Question 53

I thought ESMin 2 was going to be called ES ∞?

Question 54

No, I decided to save that for a complementary (but different) language for ESMin.

Question 55

IIRC There is a blackboard bold 2.

Question 56

@ՊՓԼՃՐՊՃՈԲՍԼ Call it ESMax (in doublestruck).

Question 57

CJam, 21 bytes

q'[,65>__el_@+W%@@+er

Not an optimal solution... yet... Try it online

Its hard to explain without grouping things, so here is a general explanation: gets input, pushes uppercase alphabet twice and lowercase twice, rotates things around, combines uppercase and lowercase strings, reverses one, and uses transliteration (similar to the Retina answer).

Question 58

Does this output a trailing newline?

Question 59

@LegionMammal978 It shouldn't unless aditsu changed how the stack is outputted.

Question 60

@LegionMammal978 I doesn't.

Question 61

C (function), 50

f(char*s){for(;*s;s++)*s=isalpha(*s)?*s+4^31:*s;}

This builds on all three previous C answers, so credit to @Ruud, @Danwakeem and @edc65.

This function modifies a char array in place.

My understanding is function entries are allowed unless explicitly banned in the question.

Try it online.

Question 62

PostgreSQL, (削除) 118 (削除ここまで) 125 bytes

SELECT s,TRANSLATE(s,t||UPPER(t),REVERSE(t)||REVERSE(UPPER(t)))
FROM(SELECT text'Programming Puzzles & Code Golf's,text'abcdefghijklmnopqrstuvwxyz't)r

SqlFiddleDemo

Output:

╔══════════════════════════════════╦═════════════════════════════════╗
║ s ║ translate ║
╠══════════════════════════════════╬═════════════════════════════════╣
║ Programming Puzzles & Code Golf ║ Kiltiznnrmt Kfaaovh & Xlwv Tlou ║
╚══════════════════════════════════╩═════════════════════════════════╝

Input: SELECT text'...'s

EDIT:

Input as table:

SELECT s,TRANSLATE(s,t||UPPER(t),REVERSE(t)||REVERSE(UPPER(t)))
FROM i,(SELECT text'abcdefghijklmnopqrstuvwxyz't)r
GROUP BY s,t

SqlFiddleDemo

Output:

╔══════════════════════════════════╦═════════════════════════════════╗
║ s ║ translate ║
╠══════════════════════════════════╬═════════════════════════════════╣
║ Hello, World! ║ Svool, Dliow! ║
║ Programming Puzzles & Code Golf ║ Kiltiznnrmt Kfaaovh & Xlwv Tlou ║
║ abcdefghijklmnopqrstuvwxyz ║ zyxwvutsrqponmlkjihgfedcba ║
╚══════════════════════════════════╩═════════════════════════════════╝

Question 63

Hey lad2025, I think this is shorter than 118, but I am no expert in the counting rules

Question 64

05AB1E, 5 bytes

žnžo‡

Uses CP-1252 character set.

Try it online!

Explanation:

žn - Push [A-Za-z]
 žo - Push [Z-Az-a]
 ‡ - Transliterate.

Ruud Helderman 6213 silver badges10 bronze badges · Accepted Answer · 2016-01-04 21:38:01Z

C, 59 bytes

Sorry for bringing up C again, but I was a bit disappointed to see only C functions here. I was under the impression OP was looking for a usable product.

main(c){while(~(c=getchar()))putchar(isalpha(c)?c+4^31:c);}

Compiled on Ubuntu 14.04 with a simple:

cc swalpha.c

The resulting executable reads any number of lines from stdin, and writes the result to stdout.

Thanks to so many of the other posters for the XOR trick.

This was the most extreme compact program that does something remarkably amazing like this! @Ruud Helderman this was extremely well done!

Swap the Alphabet

Examples

Specification

Leaderboard

60 Answers 60

C, 59 bytes

Pyth, 8 bytes

JavaScript (ES6), (削除) 69 (削除ここまで) 67 bytes

CJam, 17 bytes

Explanation

Retina, (削除) 17 (削除ここまで) (削除) 14 (削除ここまで) 13 bytes

Pyth, (削除) 10 (削除ここまで) 9

Julia, (削除) 74 (削除ここまで) (削除) 61 (削除ここまで) 47 bytes

Python, 61 bytes

C, (削除) 150 (削除ここまで) 129 Bytes

Japt, (削除) 23 (削除ここまで) 22 bytes

How it works

C, 64

R, (削除) 69 (削除ここまで) 61 bytes

Ruby, 40 bytes

Ruby, (削除) 55 (削除ここまで) 46 bytes

Jolf, 15 bytes

ESMin 2, 12 chars / 26 bytes (non-competitive)

Explanation

CJam, 21 bytes

C (function), 50

PostgreSQL, (削除) 118 (削除ここまで) 125 bytes

05AB1E, 5 bytes

Seriously, 31 bytes

Python 3, (削除) 195 (削除ここまで) (削除) 169 (削除ここまで) (削除) 168 (削除ここまで) 166 bytes

Python 2, 104 bytes

Haskell, (削除) 119 (削除ここまで) 104 bytes

Perl 6, 28 bytes

Usage:

Java, 136 bytes

Unix shell + tr + printf, 35 bytes

Python 3, (削除) 164 (削除ここまで) 159 bytes

PHP, 73 bytes

PowerShell, 65 bytes

Husk, 22 bytes

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