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<h1>The International Obfuscated C Code Contest</h1>
<h2>1990/pjr - Most Unusual Data Structure</h2>
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<div class="navbar">
<a class="Left" href="../jaw/index.html">&larr; jaw</a>
<a class="Left" href="../index.html">&uarr; 1990 &uarr;</a>
<a class="Left" href="../scjones/index.html">scjones &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.c">C code</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/Makefile">Makefile</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Peter_J_Ruczynski">Peter J Ruczynski</a><br>
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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<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<p>There is an <a href="#alternate-code">alternate version</a> that does something different
that can be used if your compiler is incapable of compiling <code>X=g()...</code> in
<code>main()</code>. It can be used for another purpose too.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./pjr</code></pre>
<h2 id="alternate-code">Alternate code:</h2>
<p>Note that some compilers will be unable to compile the expression <code>X=g()...</code> in
<code>main()</code> due to lack of temporary stack space. One might want to try replacing
<code>main()</code> with:</p>
<pre><code> main(){X=s().v().o().o().l().S().d().l().i().o().w().N();}</code></pre>
<p>if this is a problem, which is what this alternate code is.</p>
<p>NOTE: it prints something else and it is what the author suggested one try as
well.</p>
<h3 id="alternate-build">Alternate build:</h3>
<pre><code> make alt</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<pre><code> ./pjr.alt</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This program prints out a string. Can you figure out how
it is done?</p>
<p>By use of pointers to functions returning a struct of pointers
to functions!</p>
<h3 id="spoiler">Spoiler:</h3>
<p>This program prints out the string:</p>
<pre><code> the quick brown fox jumped over the lazy dog</code></pre>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>It is simple to make the program print other strings. Each
alphabetical character from a to z is printed out as its
opposite:</p>
<pre><code> a-&gt;z b-&gt;y c-&gt;x etc</code></pre>
<p>To encode a new string input the string as it is meant to come out:</p>
<pre><code> X=s().v().o().o().l().S().d().l().i().o().w().N();</code></pre>
<p>Note: <code>S()</code> represents a space and <code>N()</code> a newline. This will now
produce…</p>
<pre><code> hello world</code></pre>
<p>By the way, there is actually a piece of code which is not used
in the original program! I leave it as an intellectual exercise
to the reader to find out what it is.</p>
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<h1 id="inventory-for-1990pjr">Inventory for 1990/pjr</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.c">pjr.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/pjr.alt.c">pjr.alt.c</a> - alternate code</li>
<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>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1990_pjr.tar.bz2">1990_pjr.tar.bz2</a> - download entry tarball</li>
<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>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<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>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/pjr/.path">.path</a> - directory path from top directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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