Rename hint.txt and hint.text to README.md
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# PiE in the sky award
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Yusuke Endoh
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<mame@ruby-lang.org>
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<https://github.com/mame/>
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## Judges' comments:
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### To build:
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make endoh2
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### To run:
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./endoh2 > pi.c
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gcc -o pi pi.c
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./pi > 314.c
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...
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./endoh2 e > e.c
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gcc -o e e.c
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./e > 271.c
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...
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### Try:
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make pi
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make e
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make everything
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### Selected Judges Remarks:
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A pi/e printing quasi-quine in ASCII art with a compressed font in it;
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what else to wish for in this program? Virtual machine emulation?
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## Author's comments:
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Yeah, "Again". Sorry. But I don't feel guilty or uncomfortable.
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This entry is based on 'over-used themes' such as self reproducing
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program and pi or e computation. I know you're tired of them.
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But have you ever seen **all-in-one**?
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### What it is
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This program generates a new program in the shape of the Greek letter
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`pi`. Then, the generated program:
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- computes 3 digits of pi and prints it as a ASCII-art program that:
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- computes 4 digits of pi and prints it as a ASCII-art program that:
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- computes 5 digits of pi and prints it as a ASCII-art program that:
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- computes 6 digits of pi and prints it as a ASCII-art program that:
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- etc.
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One more thing... When you give a command line option "e" to the
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first program, the generated one will compute Napier's constant
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rather than pi.
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### Obfuscation
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This program itself is in the shape of a spigot. This is derived
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from analogy with "spigot algorithm" which infinitely computes the
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value of a mathematical constant such as `pi` or `e`.
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<http://en.wikipedia.org/wiki/Spigot_algorithm>
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The two sets of programs, 314\*.c and 271\*.c, are almost the same
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except its shape and constant computation part. I tailored the
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common part to parse in both shapes ("3.14..." and "2.71..."), by
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tweaking the computation order and adding meaningless code fragment.
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On the other hand, to make it fit inside one screen (80 x 25), my
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program is shortened properly, more than it looks. (As you may
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know, Quine needs to make its program size doubled.)
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For example, this program involves 3x5 bitmap font data of ten
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characters ('0' -- '9'), as just 20 bytes: "G1%xJ{;Q7wunmuGuu%uu".
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We can decode character n as `275*s[n+10] - 8*s[n] - 8`. I solved the
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system of Bezout's identities to find the magic string, with the
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aid of a brute force. See `find-font-table.rb` in detail.
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<http://en.wikipedia.org/wiki/B%C3%A9zout's_identity>
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I used many other tricks for short coding.
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I'm sorry that many ASCII-art-style winning entries of IOCCCs
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ignore preprocessor directives. In my program, #include is a part
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of ASCII-art with comment padded.
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These design requirements made my program well-obfuscated
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willy-nilly.
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### Portability
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I expect it to work in any major environment and C compiler.
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To build with no warning, it requires two C99 features: string
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literal more than 509 characters and omissible return in main
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function. In fact, recent compilers with "-std=c99 -Wall -W
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-Wextra -pedantic" would say nothing.
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gcc -std=c99 -Wall -W -Wextra -pedantic spigot.c
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clang -std=c99 -Wall -W -Wextra -pedantic spigot.c
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I've tested with gcc-4.6.3 and clang-3.0 on Linux (Ubuntu 12.04)
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and gcc-4.5.3 and clang-3.1 on Cygwin.
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### Synopsis
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gcc endoh2.c -o endoh2
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./endoh2 > pi.c
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cat pi.c
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gcc pi.c -o pi ; ./pi > 314.c ; cat 314.c
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gcc 314.c -o 314 ; ./314 > 3141.c ; cat 3141.c
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gcc 3141.c -o 3141 ; ./3141 > 31415.c ; cat 31415.c
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gcc 31415.c -o 31415 ; ./31415 > 314159.c ; cat 314159.c
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gcc 314159.c -o 314159 ; ./314159 > 3141592.c ; cat 3141592.c
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etc...
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./endoh2 e > e.c
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cat e.c
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gcc e.c -o e ; ./e > 271.c ; cat 271.c
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gcc 271.c -o 271 ; ./271 > 2718.c ; cat 2718.c
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gcc 2718.c -o 2718 ; ./2718 > 27182.c ; cat 27182.c
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gcc 27182.c -o 27182 ; ./27182 > 271828.c ; cat 271828.c
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gcc 271828.c -o 271828 ; ./271828 > 2718281.c ; cat 2718281.c
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etc...
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You can do `make everything` for the process (with no `cat`).
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Note: The executable may return a failure (non-zero) exit status
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unless -std=c99 option is given.
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--------------------------------------------------------------------------------
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<!--
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(c) Copyright 1984-2015, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
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This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
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[judges]: http://www.ioccc.org/judges.html
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[cc]: http://creativecommons.org/licenses/by-sa/3.0/
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-->
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