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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2000/primenum - Best abuse of CPP</h2>
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<h3>Source with English words that looks like a prime tester</h3>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2000%2Fprimenum%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Raymond_Cheong">Raymond Cheong</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 2000/primenum/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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||
<p>The current status of this entry is:</p>
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||
<blockquote>
|
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<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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</blockquote>
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<p>For more detailed information see <a href="../../bugs.html#2000_primenum">2000/primenum in bugs.html</a>.</p>
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||
<h2 id="to-use">To use:</h2>
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<pre><code> echo n | ./primenum n</code></pre>
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<p><strong>NOTE</strong>: <code>n</code> is an integer.</p>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Just stop and read the program; it won’t take long. Once you’ve figured
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out what it does, run it. It may surprise you.</p>
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<p>This entry won, not because the obfuscation is impenetrable, but because
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it successfully fooled half of the judges, including me.</p>
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<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
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<p><strong>If you want a greater challenge, don’t read any further</strong>:
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just try to understand the program via the source.</p>
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<p>If you get stuck, come back and read below for additional hints and information.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="description">Description</h3>
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<p>For 15 years, IOCCC entries have obfuscated programs using esoteric,
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difficult-to-interpret, confusing algorithms. This entry finally bucks
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that trend and obfuscates in the most “obvious” way possible: by
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||
painstakingly describing the algorithm in clear pseudocode. Even novice
|
||
programmers will recognize that the program should find and print prime
|
||
numbers up to a given number (as specified on the command line).</p>
|
||
<p>But novice programmers especially know that mistakes are often made in
|
||
translating pseudocode to real code, often resulting in programs with
|
||
unexpected and confusing output. Clearly, the program contains several
|
||
syntax “mistakes” (e.g. <code>LessThanOrEqualTo</code>) and blatant “errors” (e.g.
|
||
<code>Zero</code>). This program clearly requires “debugging.”</p>
|
||
<p>As a result of these “bugs”, the program does not calculate primes at all.
|
||
Instead, the program reads input from <code>stdin</code> and returns garbled text on
|
||
<code>stdout</code>. Fortunately, you can recover the original message simply by
|
||
running the program a second time. Try:</p>
|
||
<pre><code> ./primenum n < textfile | ./primenum n > textfile2
|
||
diff textfile textfile2</code></pre>
|
||
<p>where <code>n</code> is the same number (modulo 64). So, the prime number generator
|
||
is actually a simple text encoder/decoder! Of course, don’t forget that
|
||
argument, otherwise the “bugs” in the program will cause it to crash!</p>
|
||
<h3 id="features">Features</h3>
|
||
<ul>
|
||
<li><p>The program attempts to mislead the reader into thinking that it
|
||
generates prime numbers. It does this by:</p>
|
||
<ul>
|
||
<li>describing a correct algorithm in pseudocode;</li>
|
||
<li>using partially correct conversion of pseudocode to real code;</li>
|
||
<li>using suggestive variable names; and</li>
|
||
<li>using a suggestive program name.</li>
|
||
</ul></li>
|
||
<li><p>The program demonstrates a novel method of abusing the C preprocessor.</p></li>
|
||
<li><p>Determining how the filter algorithm works is left as an exercise to the
|
||
reader.</p></li>
|
||
<li><p>OK, so running it through the preprocessor strips away the prime
|
||
number front. But ye be warned: “not a11 variab1es1es are identica1” :-)</p></li>
|
||
<li><p>Other features include</p>
|
||
<ul>
|
||
<li>useless variables</li>
|
||
<li>useless if</li>
|
||
<li>a for loop that’s used as an if statement</li>
|
||
<li>dependence on the high bit being 0</li>
|
||
</ul></li>
|
||
<li><p>Try also
|
||
<code>echo THIS MESSAGE IS IN ALL CAPS | ./primenum 32</code></p></li>
|
||
</ul>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
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|
||
|
||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2000primenum">Inventory for 2000/primenum</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/primenum.c">primenum.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/primenum.orig.c">primenum.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2000_primenum.tar.bz2">2000_primenum.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2000/primenum/.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/2000/primenum/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
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|
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|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
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|
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https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
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|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
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src="../../png/sa.png"
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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>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2000%2Fprimenum%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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