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<h1>The International Obfuscated C Code Contest</h1>
<h2>2001/williams - Best graphic game</h2>
<h3>Plays X-based missile command</h3>
</div>
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<a class="Left" href="../westley/index.html">← 2001/westley</a>
<a class="Left" href="../index.html">↑ 2001 ↑</a>
<a class="Left" href="../../2004/anonymous/index.html">2004/anonymous →</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2001/williams/williams.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#John_Williams">John Williams</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
compile. For more information see the
FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: known bug - please help us fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2001_williams">2001/williams in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./williams</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p><a href="https://en.wikipedia.org/wiki/WarGames">A strange game. The only winning move is not to
play</a>. No, really; you can’t
actually win. :)</p>
<p>The formatting really wants a wide screen; if you can’t read it that way, it’s
the standard “three triangles around a circular” logo for nukes.</p>
<p>This is a pretty straightforward game.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>What this program does:</p>
<p>It plays <a href="https://en.wikipedia.org/wiki/Missile_Command">Missile Command</a>,
complete with MIRVs, smart bombs, extra cities, and scoring.</p>
<p>Command line arguments and input files are ignored.</p>
<p>To play, just point and click where you want your ABMs to explode.</p>
<p>The score is 10 points for each missile which is destroyed before
it reaches the ground, -1 point for each ABM used, and 100 bonus
points for each city left at the end of a level.</p>
<p>The game ends when you lose all your cities, although you will have
to wait until the level finishes raining down to see your final score.</p>
<h3 id="obfuscation">Obfuscation</h3>
<p>The main obfuscation technique is the need to compress the code to fit
all the functionality within the size limits. I could not have included
smart bombs without the rule excluding <code>{};</code> characters in the counts.
All of the <code>#define</code>s are there to reduce code size.</p>
<p>On the other hand, I did waste a few characters in order to include
some rather obfuscated math in the program. It uses fixed-point
arithmetic, resulting in the overuse of bitwise shift operators.
Another example is <code>(x|1)</code>, which is used in a couple different ways.
The purpose of <code>A/(x|1)</code> is probably obvious, but what does <code>(x|1)%2</code> do?</p>
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<h1 id="inventory-for-2001williams">Inventory for 2001/williams</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/williams/williams.c">williams.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/williams/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2001/williams/williams.orig.c">williams.orig.c</a> - original source code</li>
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<li><a href="2001_williams.tar.bz2">2001_williams.tar.bz2</a> - download entry tarball</li>
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<li><a href="index.html">index.html</a> - this web page</li>
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src="../../png/by.png"
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src="../../png/sa.png"
alt="arrow looping back on itself inside circle symbol"><br>
You should <b>carefully review</b> the
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
target="_blank"
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
before using the licensed material.<br>
You may wish to review the
<b><a href="../../license.html"
target="_blank"
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
of <b>CC BY-SA 4.0</b>.<br>
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<div id="coda"><h3>Coda</h3>
<p>
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