Files
Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2018/giles - Most unstable</h2>
<h3>SDL falling sand</h3>
</div>
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<div class="navbar">
<a class="Left" href="../ferguson/index.html">&larr; 2018/ferguson</a>
<a class="Left" href="../index.html">&uarr; 2018 &uarr;</a>
<a class="Left" href="../hou/index.html">2018/hou &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2018/giles/prog.c">C code</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2018/giles/Makefile">Makefile</a>
<a class="Right" href="#inventory">Inventory</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2018/giles/prog.orig.c">Original C</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Edward_Giles">Edward Giles</a><br>
Location: <a href="../../location.html#AU">AU</a> - <em>Commonwealth of Australia</em> (<em>Australia</em>)</li>
</ul>
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<h2 id="to-build">To build:</h2>
<p>This entry requires SDL2 to be installed. See the
FAQ on “<a href="../../faq.html#SDL">SDL1 and SDL2</a>”
if you don’t have it
installed and don’t know how to do so.</p>
<pre><code> make</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> ./prog</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./prog ioccc.txt
./prog prog.c
./prog sand.txt
./prog sand.alt.txt</code></pre>
<p><strong>NOTE</strong>: these invocations will take quite some time to finish.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Can you explain the behavior of the program when <a href="ioccc.txt">ioccc.txt</a> is given
to it as input?</p>
<p>How would the description of the state machine look like when translated from
Polynomish to English?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="remarks">Remarks</h3>
<p>This entry graphically displays a simulation of sand falling.
It uses SDL to draw the interface.</p>
<p>The code makes the following assumptions about the underlying system:</p>
<ul>
<li>SDL2 is installed from <a href="https://libsdl.org">https://libsdl.org</a> or your
package manager.</li>
<li><code>double</code> is an IEEE 754 floating-point type and <code>sizeof(double)==8</code>.</li>
<li>The compiler supports the C99 standard.</li>
</ul>
<p>In order to simulate the motion of the sand, a cellular automaton is used. The
state transition table is not stored directly. Instead, the program stores the
coefficients of a polynomial that map each state to the correct one. These
coefficients are stored as raw hexadecimal in the <code>V[]</code> array, and they are
reinterpreted as <code>double</code>s when used. This allows more numeric precision in fewer
characters (base 16 &gt; base 10), and makes the purpose of the array less clear.</p>
<p>The code is laid out graphically as a bucket pouring sand, and it is far easier
to observe this high-level layout than the code’s actual function.</p>
<p>The preprocessor is used to both obfuscate the code as a whole and abbreviate
the calls to SDL. Additionally, throughout the code, the variables were named
so that they are short and easily confused with each other.</p>
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<div id="inventory">
<h1 id="inventory-for-2018giles">Inventory for 2018/giles</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="ioccc.txt">ioccc.txt</a> - sample input</li>
<li><a href="sand.alt.txt">sand.alt.txt</a> - sample input</li>
<li><a href="sand.txt">sand.txt</a> - sample input</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2018_giles.tar.bz2">2018_giles.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2018/giles/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
</ul>
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<div id="coda"><h3>Coda</h3>
<p>
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2018%2Fgiles%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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