Landon Curt Noll
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<div class="outfit-font"><a href="../../judges.html">The IOCCC Judges</a></div>
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>1990/pjr - Most Unusual Data Structure</h2>
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<div class="navbar">
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<a class="Left" href="../jaw/index.html">← jaw</a>
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<a class="Left" href="../index.html">↑ 1990 ↑</a>
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<a class="Left" href="../scjones/index.html">scjones →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1990%2Fpjr%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#Peter_J_Ruczynski">Peter J Ruczynski</a><br>
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 1990/pjr/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<p>There is an <a href="#alternate-code">alternate version</a> that does something different
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that can be used if your compiler is incapable of compiling <code>X=g()...</code> in
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<code>main()</code>. It can be used for another purpose too.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./pjr</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>Note that some compilers will be unable to compile the expression <code>X=g()...</code> in
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<code>main()</code> due to lack of temporary stack space. One might want to try replacing
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<code>main()</code> with:</p>
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<pre><code> main(){X=s().v().o().o().l().S().d().l().i().o().w().N();}</code></pre>
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<p>if this is a problem, which is what this alternate code is.</p>
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<p>NOTE: it prints something else and it is what the author suggested one try as
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well.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<pre><code> ./pjr.alt</code></pre>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This program prints out a string. Can you figure out how
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it is done?</p>
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<p>By use of pointers to functions returning a struct of pointers
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to functions!</p>
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<h3 id="spoiler">Spoiler:</h3>
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<p>This program prints out the string:</p>
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<pre><code> the quick brown fox jumped over the lazy dog</code></pre>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>It is simple to make the program print other strings. Each
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alphabetical character from a to z is printed out as its
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opposite:</p>
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<pre><code> a->z b->y c->x etc</code></pre>
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<p>To encode a new string input the string as it is meant to come out:</p>
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<pre><code> X=s().v().o().o().l().S().d().l().i().o().w().N();</code></pre>
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<p>Note: <code>S()</code> represents a space and <code>N()</code> a newline. This will now
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produce…</p>
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<pre><code> hello world</code></pre>
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<p>By the way, there is actually a piece of code which is not used
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in the original program! I leave it as an intellectual exercise
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to the reader to find out what it is.</p>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div id="inventory">
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<h1 id="inventory-for-1990pjr">Inventory for 1990/pjr</h1>
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</div>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.c">pjr.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.alt.c">pjr.alt.c</a> - alternative source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.orig.c">pjr.orig.c</a> - original source</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="1990_pjr.tar.bz2">1990_pjr.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/README.md">README.md</a> - markdown source for this web page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/.path">.path</a> - directory path from top directory</li>
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<li><a href="index.html">index.html</a> - this web page</li>
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</ul>
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<hr style="width:10%;text-align:left;margin-left:0">
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<h4>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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<div id="copyright"><h2>Copyright and CC BY-SA 4.0 License</h2></div>
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<p>All IOCCC content including this file and web page are:</p>
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<b> Copyright © 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
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<p>This work is licensed by Landon Curt Noll under:</p>
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<p><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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target="_blank" rel="license noopener noreferrer" style="display:inline-block;"> CC BY-SA 4.0
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<p>The <b>CC BY-SA 4.0 LEGAL CODE</b> for this license is found under:</p>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1990%2Fpjr%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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