Linked Questions

23
votes
19answers
3k views

Faux Source Code

Output one random character for each character of source code (as illustrated below). The probability of each character is its frequency in the original source code. Thus the output will be fake ...
30
votes
8answers
2k views

A Fragile Quine

A Fragile Quine A fragile quine is a quine that satisfies the property of having each substring made by removing a single character, when evaluated, produces an error. For example. If your program <...
5
votes
10answers
1k views

I hate Mondays!

You should a program in language X, which will only output its source code (i.e function as a quine) when it is not a monday. On monday it should output some string with a levehnstein distance of 4 ...
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!" ...
17
votes
25answers
2k views

Good Old Suffix Vector

Inspired by an old manual... The challenge I define the ath suffix vector of b as the boolean list of length a with b trailing truthy values. Write a program or function that, given a and b by any ...
10
votes
6answers
378 views

Transpose quine

In this quine variant, your program must output its source code transposed across the diagonal from the top left to the bottom right. For example: your program on four lines outputs ...
38
votes
14answers
3k views

1-up your average quine

A 1-up quine is a program which is very similar to a quine. The one major difference is that instead of printing itself once, when n copies of the program are concatenated, the result prints the ...
19
votes
20answers
2k views

Write a Metaquine

A metaquine is a program which is not a quine, but whose output, when run as a program in the same language, is a quine. The goal of this challenge is to write a metaquine. This is code-golf, so ...
10
votes
4answers
485 views

Write a Semiquine

Suppose you have 2 languages, A and B. A string s is a semiquine in ...
33
votes
12answers
2k views

Tips for golfing in vim

I've recently realized how vim works great for golfing, especially for kolmogorov-complexity. Also, according to meta vim is a perfectly acceptable 'programming language' at least, for the scope of ...
2
votes
0answers
727 views

Make a program that outputs its own MD5 hash [duplicate]

Challenge: make a program that outputs a MD5 hash of its source code. You should not use tricks that would be considered cheating in a quine sense (discussed here). Using built-in functions and ...
22
votes
4answers
519 views

Multiple program Quinecatenate!

Your task is to give three different languages A, B, C, and write two different programs P and Q such that: P is a quine in language A, but not a quine in B nor C; Q is a quine in language B, but ...
27
votes
12answers
2k views

Quine / Reverse Quine

Write a complete program that takes a boolean or non-negative integer input. It must: Output its own source code if the input value is falsy Output its own source code in reverse if the input value ...
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 ...
205
votes
302answers
49k 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 ...

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