What's Wrong With This Hello World? 

When I started my first job, IE6 was still a thing (ugh) and we used a polyglot hack to detect which browser the code was running on so we can do firefox or IE6-specific nonsense to fix the layout.

I already could guess html was doing something weird

This looks like if Malbolge was human """readable"""". And HTML had to be the weirdest of the three, browsers are surprisingly lenient with invalid code

reminds me of using encryption to create a single image that can transform into 20 other images depending on which decryption algorithm you use on it. something like: Take the target (the image or source code you want to hide) Decrypt the code using a specific key. (key can be whatever you want) This creates a jumbled nonsensical decrypted file of something that was never encrypted. comment out the decrypted mess and then copy and paste them to the bottom of the original image you want to encrypt. Then encrypt the original image. (the previously jumbled nonsense will unscramle and reveal the target image while the encryption simultaneously jumbles the source code or original image.) Basically a trojan horse.

The file manager i use, ranger, uses this to have a bash script inside its binary file. If you run it with python, it will execute the python code normally, but when you exit the program you go back to whatever directory you were at when you opened it. If you instead source the binary with bash, it will run a script inside a multi-line string that will run the program and then change your working directory to whatever directory you were at when you closed it. Cool stuff :)

8:04 The parameter to print(x) is unused. Also, you don't need to write return 0 if you are using C99 or later. It isn't a problem, I just really want to mention it.

One of the earliest IOCCC entries used polyglot machine code so the same binary could be run on PDP-11 and VAX. I think MacOS supported multi-arch binaries at some point but they just used different entry points for each one.

I'm a bit surprised this works in Python 2, since print didn't become a function until Python 3, and at one point you had to include a line "from __future__ import print_function" in order to use it that way. I guess it's because, as long as you leave a space between the word "print" and the opening parenthesis, the parentheses are just treated as grouping the arguments of the print statement? Would have been interesting to mention that aspect.

You can get rid of one duplication of the string "Hello world" by using the macro parameter in C. You still can add the " " in the macro by using the string concatenation feature in C, that is, "Hello world" " " is the same as "Hello world ". So you can write #define print(arg) int main() { printf(arg " "); return 0; }.

So far, my record is 5 (ruby, python, javascript, haskell & lua) but I like the #define idea so i'll try to improve on my polyglot For reference: a = 1; --a; 1 //2; console = type("console", (object, ), {"log": print})#/.to_s[7].to_i; puts "Hello World"; exit --a; print = console.log main = print("Hello World")

Pure javascript instead of html would complicate things a bit as js is close syntax wise to C. I can't think of a way to do it but I'm sure it's possible. Just need a single C preprocessor statement that js ignores

There is a bootable pdf document out there which can be booted up in a VM and also opened in a PDF reader

It depends what you use to exec it(if Python interp it will print 1 time because the rest is just comments, using html will alert hello world and ignore the rest and using GCC it would skip non C code because of /*)

Ok, before watching this I read through it and can already see it’s devilishly clever. Using define with a multiline comment containing a Python multiline string and using HTML as a way to practically comment out the rest of the code for the JS solution is something I wouldn’t have thought of, nor would I have thought to define a 0 CLI output Python function to a macro defining the C main. This is brilliant!

i was not expecting to see 600 videos. this is criminally underrated and high quality content.

for my fellow brits, the "pound sign" is a hash. took me a little long to figure that out.

ok now make a polyglot quine

Significant whitespace is a crime against humanity.

php also uses echo and print for displaying text on a webpage. so you can do that and shove and exit; after it to stop it from running the rest of the code.

That is really impressive!

I thought he was going to display hello world in 3 languages as in something like English, Spanish and Mandarin depending on the language settings of the device.

now i want to see someone code 2 different games in one file using 2 different programming languages

This is unbelievably cursed and I love ot

I didn't get why we need the "#define foo bar" thing. In C/C++ empty preprocessor directives are allowed so just "# /*" should be fine, right?

I think that one might be able to get it to work in MATLAB, FreeMat, and Octave with minimal difficulty..

It seems like rather than specifying "C or C++", you should average them out and just say C+

You say "in most sane languages" and one of the examples is Racket

I've used similar techniques to embed python scripts in C++ code. Quick and dirty but it works just fine.

Ah I thought this was about Polyglot notebooks in VSCode. But still awesome regardless.

you could also do #include // document.documentElement.style.display="none"; #define print(str) int main(void) { printf(str " "); } // alert("Hello, World!"); print("Hello, World!")

Just saying, there are a lot of languages where empty file is valid syntax (pretty much every language that doesn't use a main function)

Couldn't you replace the #define foo bar with the include statement to simplify things?

Next challenge: syntax highlighting

THIS IS ONE OF THE MOST COOL THINGS I HAVE EVER SEEN

I did not know you could use Print to print in Ruby, I thought you had to use Puts.

this is really cool

harro warudo

1st guess: it's a program that is designed to work in html, python and c.

While I think the video is great, I would appreciate if you stopped flashbanging my eyes every time you switch to a screenshot. Some consistency in the brightness levels would be great

scrolled down only to see the criminally lacking number of comments. so here i am.

Hello, World by Rick.

also make it work in assembly

very cool

Decent

nice

Why not just use the load event?

I was wondering if #define foo bar could be replaced with #include

thats not a pound sign, its a hash

html changes a lot

This is incredible, how does one's brain think of this

Gaming

Hi

if there is a python 2 and 3 what about python 1

i only know cpp 😬

add rust

Would be good if you included java❤😊

I think the following would be better: #define print(x) int main() { printf("%s ", x); } Or you can use #define float(x) int main() { float(1) #undef float(x) #define print(x) printf("%s ", x); print("Hello, World!") #define float(x) } float(1) #undef float(x) If we use C++ rather than C, we can replace with and `printf("%s", x)` with `std::cout

Zzzz

Please stop calling # £

Couldn't #include on line 1 replace the need to #define foo bar?

the best I could do, optimising for number of characters I also tried and failed to include common lisp and literate haskell, and this doesn't work with julia: #include//document.documentElement.style.display="none";alert("Hello, world!")\ "echo" "Hello, world!";"exit";"" #define print(x) int main(){puts(x);} print("hello, world!")

8:04 @JeffHykin noice found you :)

why use define foo bar at the top instead of just including stdio.h there instead of below

I still donʼt understand why you need the `#define foo bar`. Couldnʼt you have started the C multiline comment on the `#include ` line? Thatʼd make the Brainfuck part harder or impossible but otherwise should work.