Linked Questions

49 votes
35 answers

PPCG Jeopardy: Cops

How well do you know the site? Let's find out. This is a cops-and-robbers challenge. Robber's thread. As a cop, you need to: Find a non-deleted, non-closed challenge on this site to answer. The ...
Nathan Merrill's user avatar
23 votes
39 answers

Palindromic palindrome generator

Create a program, that converts input string to a palindrome starting with the input string. The program itself must be a palindrome. For example input: neverod, ...
tmp's user avatar
  • 481
38 votes
13 answers

Palindromic palindrome checker [closed]

Write a program to test if a string is palindromic, with the added condition that the program be palindromic itself.
moinudin's user avatar
  • 12.5k
20 votes
31 answers

Multiply all numbers in a string

Winner: Chilemagic, a massive 21 bytes! You may continue to submit your answer, however you can no longer win. Original post kept: Your goal is to find all numbers in a string, and multiply each one ...
Jon's user avatar
  • 1,573
27 votes
10 answers

Heterograms, Palindromes, oh my!

(First challenge, please let me know if there are any problems with it.) A heterogram is a word where no letter of the alphabet occurs more than once, and a palindrome is a phrase that is the same ...
a spaghetto's user avatar
  • 11.2k
14 votes
19 answers

Mirror and reverse text

Inspired by I reverse the source code, ... Your task, if you wish to accept it, is to reverse text and mirror select characters. Yes, yes, I know. Very surprising. Input A string, ...
S.S. Anne's user avatar
  • 3,300
18 votes
17 answers

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
23 votes
8 answers

I'm symmetric, not palindromic!

Background Inspired by I'm a palindrome. Are you?, where it is presented the shocking fact that “()() is not a palindrome, but ...
Renzo's user avatar
  • 2,568
17 votes
7 answers

Normal and visual string reversion

Write some code that acts as a cat program. That is, to input a string and output it as is. But the normal reversion of your code must output the normal reversion of the input string. And the visual ...
jimmy23013's user avatar
  • 36.9k
18 votes
2 answers

Find out if this a valid Stack Cats program, in Stack Cats style!

Background Stack Cats is a reversible esoteric language made by Martin Ender. Each command in Stack Cats is either the inverse of itself (represented as a symmetric character, such as ...
Bubbler's user avatar
  • 73.8k
4 votes
4 answers

The Essential™ (comment-free) Convenient Palindromic Quine Golf

A program is "conveniently palindromic" if it is equal to the string derived when its reverse has all its parentheses (()), brackets (...
noɥʇʎԀʎzɐɹƆ's user avatar