Linked Questions

517 votes
976 answers

"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
552 votes
241 answers

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 ...
235 votes
368 answers

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
172 votes
494 answers

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
112 votes
330 answers

Simple cat program

One of the most common standard tasks (especially when showcasing esoteric programming languages) is to implement a "cat program": read all of STDIN and print it to STDOUT. While this is named after ...
Martin Ender's user avatar
79 votes
261 answers

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
86 votes
224 answers

Count up forever

Write a program that counts up forever, starting from one. Rules: Your program must log to STDOUT or an acceptable alternative, if ...
vrwim's user avatar
  • 2,499
84 votes
193 answers

Output the sign

Given a number N, output the sign of N: If N is positive, output 1 If N is negative, output -1 If N is 0, output 0 N will be an integer within the representable range of integers in your chosen ...
user avatar
91 votes
119 answers

N(e(s(t))) a string

To "function nest" a string, you must: Treat the first character as a function, and the following characters as the arguments to that function. For example, if the input string was ...
DJMcMayhem's user avatar
  • 59.2k
84 votes
55 answers

Can you outgolf me? (Cops section)

Cops section The robbers section can be found here. Thanks to FryAmTheEggman, Peter Taylor, Nathan Merrill, xnor, Dennis, Laikoni and Mego for their contributions. Challenge Your task is to write 2 ...
Adnan's user avatar
  • 44.4k
36 votes
88 answers

Code ladder, Cops

Note: This challenge is finished. Submissions are still welcome but can not win. This is the cops' thread. The robbers' thread goes here. Write a code that outputs the integer ...
Stewie Griffin's user avatar
41 votes
51 answers

Cops: Make a regex - Make a snake

This is the cop's thread. The robber's thread is here. Write a code that takes an input n and creates a n-by-n "snake matrix". A snake matrix is a matrix that ...
Stewie Griffin's user avatar
41 votes
18 answers

Overlapping Polyglots

Unlike many C&R challenges, this does not require a separate robbers post; the goal of the robbers is to crack the previous answer and then post a new one as a cop. As answerers, you will write a ...
Esolanging Fruit's user avatar
20 votes
27 answers

Exploded Suffixes

Given an ASCII string, output the exploded suffixes of it. For example, if the string was abcde, there are 5 suffixes, ordered longest to shortest: ...
miles's user avatar
  • 16.9k
26 votes
8 answers

Create a programming language that only appears to be unusable (Robbers' thread)

See the cop thread for more information. Each answer to this question should crack an answer there. That is to say, it should be code to find the third-largest integer in the input when run in the ...
feersum's user avatar
  • 31.4k

15 30 50 per page