Linked Questions

13
votes
11answers
2k views

Double-duty quine: quine!dlroW ,olleH

Write a program that will output its own source code when run, and nothing else. Seems easy, right? The catch is that when the source code is reversed, your program must output "Hello, World!" ...
450
votes
799answers
142k views

“Hello, World!”

So... uh... this is a bit embarrassing. But we don't have a plain "Hello, World!" challenge yet (despite having 35 variants tagged with hello-world, and counting). While this is not the most ...
209
votes
308answers
50k views

Is this number a prime?

Believe it or not, we do not yet have a code golf challenge for a simple primality test. While it may not be the most interesting challenge, particularly for "usual" languages, it can be nontrivial in ...
75
votes
17answers
15k views

Build a Faulty XKCD Browser

Challenge Given the number of an XKCD comic, output the title text of that comic (the mouseover text). However, the program must throw an error when given the numbers ...
52
votes
90answers
9k views

Print X without X (cop's thread)

This is the cop's thread of a cops-and-robbers challenge. You can view the robber's thread here A pretty common beginner style question is to print some string, but, there's a catch!, you need to do ...
520
votes
235answers
118k views

Showcase of Languages

Notes This thread is open and unlocked only because the community decided to make an exception. Please do not use this question as evidence that you can ask similar questions here. Please do not ...
107
votes
103answers
13k views

Make an error quine!

Your challenge: write a "program", for a language of your choice, that causes the compiler/interpreter/runtime to produce error output when compiling/running your program which is identical to your ...
78
votes
52answers
12k views

Tips for golfing in Haskell

What general tips do you have for golfing in Haskell? I am looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Haskell. Please post only one ...
69
votes
226answers
22k views

Is this even or odd?

Note: There is not been a vanilla parity test challenge yet (There is a C/C++ one but that disallows the ability to use languages other than C/C++, and other non-vanilla ones are mostly closed too), ...
32
votes
21answers
3k views

Cat, Quine, Hello World

Write a cat program, a quine, and a Hello World in the same language such that when two specific programs of the three are concatenated in a certain order, you get the third program. It does not ...
13
votes
7answers
388 views

Inspired by HQ9+: 4-Behavior Polyglot

Create a program that can be run in 4 different languages such that: One language prints "Hello World!" One language outputs its own source code One language outputs 99 bottles of beer on ...
35
votes
8answers
2k views

Draw Reutersvärd's Triangle

This impossible object is Reutersvärd's triangle: Draw your own version according to these rules: Exactly 9 cubes total Each side is made up of exactly 4 cubes The cubes appear to overlap such that ...
130
votes
285answers
27k views

Shortest code to produce infinite output

Write the shortest code you can that produces an infinite output. That's all. You code will only be disqualified if it stops producing output at some point. As always in code golf, the shortest code ...
29
votes
7answers
2k views

Tips for Creating/Maintaining a Golfing Language

Creating a golfing language can be hard. Let's help budding golfing language creators out and provide some helpful tips on how to create one. I'm looking for tips on: The design process ...
10
votes
5answers
1k views

It's Anagram Quine, not just Quine!

The Task In this challenge, your task is to write a program, which takes in no input, with as many anagrams that are quine of themselves as possible. Your score will be the number of anagrams of your ...

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