Linked Questions

198
votes
295answers
46k 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 ...
60
votes
97answers
10k views

Print the last, middle and first character of your code

The challenge is simple: Print the last, middle, and first character of your program's source code, in that order. The middle character is defined as follows, assuming a source length of ...
428
votes
771answers
131k 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 ...
30
votes
43answers
3k views

Generating a random alphanumeric string of length N

What is the shortest way of generating a random string with a given length and with only alphanumeric characters allowed? example of a random string: with N = 9 output would be ...
122
votes
272answers
26k 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 ...
67
votes
212answers
20k 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), ...
25
votes
8answers
5k views

The Bowlers-Golfers Fraction War

Introduction Let's start by arranging all fractions from 0 to 1 in order of lowest denominator, then lowest numerator: 1/2, 1/3, 2/3, 1/4, 3/4, 1/5, 2/5, 3/5, 4/5, 1/6, 5/6, 1/7... Note that ...
509
votes
230answers
114k 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 ...
30
votes
30answers
2k views

A Quine on Every Line

Your goal is to create a program that prints itself indefinitely, with a new line after each one. Thus, if your program is a one-liner, it would be repeated on every line of the output. Example ...
8
votes
4answers
334 views

Rock Paper Scissors (Sorta) Quine

Create three programs, which we'll call Rock, Paper, and Scissors. Each program must be unique, and accept input. If a program gets any input which is not one of the programs Rock, Paper or ...
111
votes
49answers
33k views

Program that creates larger versions of itself (quine-variant)

You are to write a program that will output source code that is Larger than the original program (character wise) Will print another program larger than itself when run (i.e. the new program is also ...
169
votes
97answers
38k views

Programming Languages Through The Years

In this challenge, users will take turns completeing three fairly simple coding tasks in programming languages that are allowed to be progressively older. The first answer must use a programming ...
85
votes
67answers
14k views

Print your code backwards - reverse quine

Write a program that prints its own source code out backwards, in other words an eniuq. Scoring: +50 if you use pull data from the Internet. +25 if you read your own source code. +1 point per ...
30
votes
14answers
4k views

2 Cats in a Quine

Challenge Make two programs, A and B, which are both cat programs in the same language. When concatenated, AB (also in the same language) should be a quine. For example, suppose ...
104
votes
99answers
12k 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 ...

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