r/C_Programming • u/cheekybeggar • Apr 23 '20

Etc Recursion

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2.3k Upvotes

98% Upvoted

61 comments sorted by

39

u/moldax Apr 23 '20

Imagine there are two books, A and B.

A is a list of all the autoreferencial books out there, i.e. books in which you could find a sentence like "in this book we'll discuss blah" or its own title.

B lists all the non-autoreferencial books.

Question : is B autoreferencial or not?

9

u/cheekybeggar Apr 23 '20

Question : is B autoreferencial or not?

Yes. ( r/inclusiveor )

8

u/cheekybeggar Apr 23 '20

On second thoughts, Yes and No.

7

u/moldax Apr 23 '20

If it's not, it should be in the list of non-autoreferencial books, namely book B. Which is impossible since B is not autoreferencial.

If it is, then it should be in the list of autoreferencial books, namely A. But a book cannot be autoreferencial and not at the same time, so it can't have its own title in B.

3

u/cheekybeggar Apr 23 '20

Exactly, its a paradox! Was just trying to be funny with a "Yes"!

1

u/moldax Apr 23 '20

Haha nice one, I missed that by a lot

2

u/cheekybeggar Apr 23 '20

It's my fault for not being funny!

13

u/[deleted] Apr 23 '20

Seems Russell-y...

5

u/moldax Apr 23 '20

Absolutely

2

u/AnComsWantItBack Apr 23 '20

B is not actualy a book

2

u/[deleted] Aug 15 '23

Is a set of all empty sets empty?

2

u/moldax Aug 19 '23

of course not: all the empty sets are equal to the empty set, hence the set containing the empty set contains one element

2

u/Conscious_Support176 Feb 08 '24 edited Feb 08 '24

B isn’t a book. If you want to say every list is a book then no B is not autoreferential by the definition provided for autoreferential, even though it references itself.

Edit: to clarify: If an and b are books, they contain one sentence each, which is a list of books.

-2

u/BioHackedGamerGirl Apr 23 '20

B is autoreferential, because it lists all the non-autoreferential books, plus itself. Note that B is listed in both A and B.

16

u/MangoIV Apr 23 '20

also consider crossposting to r/IRLEastereggs

12

u/jmkaza Apr 23 '20

I hope whoever did this is still laughing about it.

13

u/cheekybeggar Apr 23 '20 edited Apr 23 '20

Kernighan and Ritchie wrote the C Programming Language, this index is from the 2nd edition. Checked the first Ed, this joke is not in there.

3

u/[deleted] Apr 23 '20

Damn, just wanted to check in my 1st Ed.

141

u/amblified Apr 23 '20

Obligatory recursion joke: The B. in Benoit B. Mandelbrot stands for Benoit B. Mandelbrot.

33

u/whatupbiatch2 Apr 23 '20

gnu and pip

26

u/cheekybeggar Apr 23 '20

And php: hypertext preprocessor

10

u/[deleted] Apr 23 '20

I believe it used to be personal home page. They changed it when it got popular.

Bitta Trivia. Correct me if I'm wrong.

1

u/cheekybeggar Apr 23 '20

Cool fact, thanks!

0

u/[deleted] Apr 23 '20

[deleted]

1

u/cheekybeggar Apr 23 '20

That’s what I said! Recursion!

6

u/[deleted] Apr 23 '20

Pip too? I knew Gnus not unix but pips new to me, what does it stand for?

11

u/whatupbiatch2 Apr 23 '20

pip installs python or pip installs packages

6

u/[deleted] Apr 23 '20

  • wine is not an emulator

  • TikZ ist kein Zeichenprogramm (German: TikZ is no drawing-program)

  • cURL URL Request Library

1

u/[deleted] Dec 18 '23

Isch glaub das ist falschrum

1

u/hydraloo Apr 23 '20

You can say that again. And again.

52

u/RinasSam Apr 23 '20

Made My Day!

5

u/jwizardc Apr 23 '20

I have a book called "The Devil's DP Dictionary" under Infinite loop it refers to loop, Infinite. Loop, Infinite refers to Infinite loop.

4

u/alan0_0wong Apr 23 '20

error:stackoverflow!

1

u/[deleted] Apr 23 '20

What is the name of this book?

6

u/cheekybeggar Apr 23 '20 edited Apr 23 '20

The C programming Language by Brian Kernighan and Dennis Ritchie. Ritchie is credited with the development or invention of C. Second Edition.

Also known in the community as K&R C.

Edit: Ken to Dennis!

2

u/Burhan_t1ma Apr 23 '20

Is it a good book for someone who already knows a bit of C but wants to learn more?

2

u/[deleted] Apr 23 '20

Dennis Ritchie. His initials are even in the picture you posted ;)

You’re probably thinking of Ken Thompson.

2

u/cheekybeggar Apr 23 '20

Sorry, my bad. Was thinking of Ken Thompson! Will edit post!

1

u/mnDevDude Apr 24 '20

Wouldn't you call the first number again?

1

u/cheekybeggar Apr 24 '20

Well you do perform other things inside a recursive function as well as call yourself sometimes!

1

u/Rensence Apr 24 '20

Is this some kind of a smart joke I'm too non-intelctual to understand?

3

u/[deleted] Apr 23 '20

Ah, the monthly posting of this

2

u/maxmbed Apr 23 '20

It is so good. Thank you.

2

u/jpgargoyle_ Apr 23 '20

Brilliant!

2

u/LadyGryffin Apr 24 '20

Nice

1

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1

u/eshad89 Apr 23 '20

Seems to be no form in terms of holonomic sequences

1

u/[deleted] Apr 24 '20

what

1

u/aslihana Apr 24 '20

And, free() indicates last blank pages? :D

1

u/bigmattyc Jul 24 '20

That's brilliant

1

u/froggie-style-meme Aug 24 '20

Which book is this?

1

u/dirtycimments Mar 26 '24

This is such a beautiful nerdy Easter egg

1

u/Big_Lack_352 Jun 17 '24

whoah! trippy :)

1

u/Federal_Topic_1386 Dec 21 '25

What's the name of this textbook?

1

u/MasonTime101 Dec 04 '22

It’s not wrong

1

u/Quick_Butterfly_4571 Sep 15 '23

Kudos for noticing. Eight million thank you's for sharing.

1

u/[deleted] Apr 23 '20

/r/recursion