Linked Questions

393
votes
156answers
249k views

Write a program that makes 2 + 2 = 5 [closed]

Write a program that seemingly adds the numbers 2 and 2 and outputs 5. This is an underhanded contest. Your program cannot output any errors. Watch out for memory holes! Input is optional. ...
262
votes
145answers
85k views

Tips for golfing in Python

What general tips do you have for golfing in Python? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to Python (e.g. "remove comments" is ...
152
votes
280answers
43k views

1, 2, Fizz, 4, Buzz

Introduction In our recent effort to collect catalogues of shortest solutions for standard programming exercises, here is PPCG's first ever vanilla FizzBuzz challenge. If you wish to see other ...
124
votes
275answers
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 ...
221
votes
106answers
39k views

Print every character your program doesn't have

Your task is to build a program (using only printable ASCII characters and/or tabs and newlines) that prints out exactly the characters in the printable ASCII space (...
204
votes
64answers
17k views

No A, just CAPS LOCK

What happens when the CapsLock key on your keyboard doesn't have a notch in it? "This hPPENS." The goal of this program is to consistently emulate keyboard misses where each A press is replaced with ...
66
votes
100answers
9k views

Collatz Conjecture (OEIS A006577)

This is the Collatz Conjecture (OEIS A006577): Start with an integer n > 1. Repeat the following steps: If n is even, divide it by 2. If n is odd, multiply it by 3 and add 1. It is proven that ...
40
votes
110answers
8k views

Print invisible text

Given a string as input, output a number of whitespace characters (0x0A and 0x20) equal to the length of the string. For example, given the string Hello, World! ...
53
votes
73answers
7k views

Test a number for narcissism

A Narcissistic Number is a number which is the sum of its own digits, each raised to the power of the number of digits. For example, take 153 (3 digits): 13 + 53 + 33 = 1 + 125 + 27 = 153 1634: ...
55
votes
71answers
7k views

How to randomize letters in a word

According to some controversial story, the odrer of ltteres in a wrod deos not mttaer much for raednig, as lnog as the frist and lsat lteter macth with the orignial wrod. So, for fun, what would be ...
44
votes
83answers
10k views

Draw an ASCII chess board!

Here is a simple challenge for you: You must produce this ASCII representation of a chess board. White is represented by uppercase characters, and black is represented by lowercase. Empty tiles are ...
49
votes
65answers
5k views

Output the alphabet, the ALPHABET, or just a character

The challenge is simple: Write a function or program that takes an input x, and outputs the lower case alphabet if x is part of ...
36
votes
75answers
4k views

Division and remainder

This challenge, while probably trivial in most "standard" languages, is addressed to those languages which are so esoteric, low-level, and/or difficult to use that are very rarely seen on this site. ...
40
votes
59answers
8k views

List of possible birth years of living humans

The Challenge Output a list of years that starts with the current year and ends 120 years ago. The birth year of every living human would be included in this list. Details The list should be in ...
29
votes
75answers
9k views

Clearing the most significant bit from an integer

Input The input is a single positive integer n Output The output isn with its most significant bit set to ...

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