Linked Questions

522 votes
985 answers
194k 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 ...
Martin Ender's user avatar
551 votes
241 answers
136k 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 ...
236 votes
369 answers
66k 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 ...
Dennis's user avatar
  • 210k
173 votes
495 answers
35k views

Implement a Truth-Machine

A truth-machine (credits goes to this guy for coming up with it) is a very simple program designed to demonstrate the I/O and control flow of a language. Here's what a truth-machine does: Gets a ...
a spaghetto's user avatar
  • 11.2k
145 votes
334 answers
31k 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 ...
tbodt's user avatar
  • 2,426
251 votes
82 answers
83k views

Code that will only execute once

Goal The goal of this challenge is to write code that will execute once and only once. This means basically that it damages the program, script, or environment in some way. If rebooting the system ...
ojblass's user avatar
  • 2,837
220 votes
89 answers
39k views

Make your language unusable

Try to write some code in your language and make it not satisfying our criteria of being a programming language any more. A language satisfies our criteria (simplified version for this challenge) of ...
jimmy23013's user avatar
79 votes
261 answers
25k 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), ...
Matthew Roh's user avatar
  • 5,347
55 votes
203 answers
14k views

Scream very loudly

Write a script that outputs A to stdout infinitely. There should be no newlines or separators between the characters. Standard loopholes apply. This is code-golf. ...
Tornado547's user avatar
  • 1,143
40 votes
132 answers
5k views

Lolololololololololololol

Let us take a break from the brain-wrecking questions and answer some of the simpler ones You have recently read something extremely funny, and want to express your laughter to the world! But how can ...
SunnyMoon's user avatar
  • 2,699
78 votes
68 answers
23k views

Shortest program that throws StackOverflow Error [closed]

Write a program that throws a StackOverflow Error or the equivalent in the language used. For example, in java, the program should throw java.lang.StackOverflowError...
True Soft's user avatar
  • 1,095
155 votes
29 answers
20k views

Shortest Code to Legitimately Slack Off

I'm a developer, and I don't feel like doing my work. I know from XKCD that the best excuse for slacking off is that your code's compiling. Because of this, I think I need some code that will compile ...
Esolanging Fruit's user avatar
51 votes
71 answers
11k views

Shortest program that continuously allocates memory

Write a program which runs forever and allocates more and more memory on the heap the longer it runs, at least until you reach the limit of the operating system on the amount of memory that can be ...
tbodt's user avatar
  • 2,426
84 votes
42 answers
12k views

Non-discriminating Programming

We say a string is non-discriminating if each of the string's characters appears the same number of times and at least twice. Examples "aa!1 1 !a !1" is non-...
Laikoni's user avatar
  • 26.2k
46 votes
71 answers
5k views

Blinking twelve

Many electronic devices, specially old ones, will show a blinking 12:00 when the time has not been set. The purpose of this challenge is to recreate this. ...
Luis Mendo's user avatar
  • 105k
69 votes
43 answers
12k views

Tips for golfing in Bash

What general tips do you have for golfing in Bash? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Bash (e.g. "remove comments" is not ...
manatwork's user avatar
  • 20.2k
71 votes
38 answers
12k views

Enlarge ASCII art

In this challenge, you must take multiline ASCII art as input, such as: ...
Doorknob's user avatar
  • 71.5k
54 votes
31 answers
26k views

Create a memory leak, without any fork bombs [closed]

Your task is to create a memory leak. This is a program that uses loads of memory, until the computer runs out and has to do some swapping to save itself from running out. The only way that the memory ...
George's user avatar
  • 1,367
33 votes
30 answers
5k views

Ah, why is there a bug in my program?

This challenge is inspired by @LuisMendo's MATL answer to my "binary multiples" challenge. Task Pick a code-golf challenge that is open and that has been posted before this one; let me call it the "...
RGS's user avatar
  • 14.1k
25 votes
35 answers
4k views

Write an interpreter for *

The task is simple. Write an interpreter for the language *. Here's a bigger link to the wiki. There are only three valid * programs: * Prints "Hello World" <...
TheOnlyMrCat's user avatar
  • 1,349
37 votes
13 answers
2k views

Print, Increment, Decrement, Alias - Interpret Prindeal

Prindeal (pronounced prin-dee-al) is a new esoteric programming language that only has four commands: print, increment, decrement, and alias. Despite its minimalism, complex mathematical operations ...
Calvin's Hobbies's user avatar
18 votes
17 answers
1k views

PPCG Jeopardy: Robbers

How well do you know the site? Let's find out. This is a cops-and-robbers challenge. Cop's thread. As a robber, you need to: Find a non-deleted, non-closed challenge that matches a cop's ...
Nathan Merrill's user avatar
11 votes
18 answers
3k views

Shortest Code that creates a Deadlock

Write the shortest code to create a deadlock. Code execution must halt, so this doesn't work: ...
Justin's user avatar
  • 21.2k
21 votes
11 answers
2k views

Write an interpreter for my esoteric language Jumper

I have thought up esoteric language Jumper. Later you will see why. It operates with random-access-memory with bytes as cells. RAM is zero indexed and initially filled with zeros. When trying access ...
Somnium's user avatar
  • 2,669