A Quine Puzzle

#1

Post by wgreenberg » Mon, Jul 20, 2015, 5:21 PM UTC

A Quine Puzzle
wgreenberg.github.io

Re: A Quine Puzzle

#2

Post by daveloyall » Mon, Jul 20, 2015, 8:12 PM UTC

Spoiler:

cmVwZWF0IDMgMgpwcmludCAyCnJlcGVhdCAzIDIKcHJpbnQgMgpyZXBlYXQgMyAyCg==

Re: A Quine Puzzle

#3

Post by superobserver » Mon, Jul 20, 2015, 8:31 PM UTC

daveloyall wrote: post #2

Spoiler: cmVwZWF0IDMgMgpwcmludCAyCnJlcGVhdCAzIDIKcHJpbnQgMgpyZXBlYXQgMyAyCg==

Another similar to your idea: cmVwZWF0IDQgMw0KcHJpbnQgMg0KcmVwZWF0IDQgMw0KcHJpbnQgMg0KcmVwZWF0IDQgMw0KcHJpbnQgMg==

Re: A Quine Puzzle

#4

Post by JoshTriplett » Mon, Jul 20, 2015, 8:48 PM UTC

daveloyall wrote: post #2

Spoiler: cmVwZWF0IDMgMgpwcmludCAyCnJlcGVhdCAzIDIKcHJpbnQgMgpyZXBlYXQgMyAyCg==

Variant that doesn't rely on potentially undefined behavior of asking "repeat" to repeat before the beginning:

cHJpbnQgMApwcmludCAyCnByaW50IDAKcHJpbnQgMgpwcmludCAwCnJlcGVhdCAzIDIKcHJpbnQgMgpyZXBlYXQgMyAyCnByaW50IDIKcmVwZWF0IDMgMgo=

Re: A Quine Puzzle

#5

Post by personjerry » Mon, Jul 20, 2015, 8:52 PM UTC

My solution, featuring only 2 distinct commands, no NOPs, and not relying on `repeat` at the beginning: cHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcHJpbnQgMg0KcmVwZWF0IDMgMg0KcHJpbnQgMg0KcmVwZWF0IDMgMg0KcHJpbnQgMg0KcmVwZWF0IDMgMg==

Re: A Quine Puzzle

#6

Post by thrwwy457 » Mon, Jul 20, 2015, 8:55 PM UTC

repeat 4 2 print 2 repeat 4 2 print 2 repeat 4 2 print 2

Re: A Quine Puzzle

#7

Post by krajzeg » Mon, Jul 20, 2015, 8:56 PM UTC

A variant featuring only one number: cmVwZWF0IDQgNA0KcHJpbnQgNA0KcmVwZWF0IDQgNA0KcHJpbnQgNA0KcmVwZWF0IDQgNA0KcHJpbnQgNA0KcmVwZWF0IDQgNA0KcHJpbnQgNA0K

Re: A Quine Puzzle

#8

Post by jameshart » Mon, Jul 20, 2015, 9:02 PM UTC

The 'repeat' command ("repeats the last M lines of output, starting N lines from the end") isn't very well described by the documentation, so some experimentation is required. 'repeat M N' will produce no output at all when the output is empty, but will always produce M lines of output, by repeatedly looping through the last (min(N, lines of output)) lines of the output, when the output is not. That's not very intuitive.

Re: A Quine Puzzle

#9

Post by wgreenberg » Mon, Jul 20, 2015, 9:10 PM UTC

jameshart wrote: post #8

The 'repeat' command ("repeats the last M lines of output, starting N lines from the end") isn't very well described by the documentation, so some experimentation is required. 'repeat M N' will produce no output at all when the output is empty, but will always produce M lines of output, by repeatedly looping through the last (min(N, lines of output)) lines of the output, when the output is not. That's not very intuit…

Agreed, the descriptions could use some work. That said, I tried to strike a balance between correctness and simplicity when describing the commands so people could quickly get to trying stuff out.

I do show that particular edge case (along with "print 0") in the examples, though.

Re: A Quine Puzzle

#10

Post by jimmaswell » Mon, Jul 20, 2015, 9:27 PM UTC

empty input gets empty output, solved