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>1994/imc - Most obfuscated algorithm</h2>
<h3>print a random n by n magic square</h3>
</div>
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<div class="navbar">
<a class="Left" href="../horton/index.html">&larr; 1994/horton</a>
<a class="Left" href="../index.html">&uarr; 1994 &uarr;</a>
<a class="Left" href="../ldb/index.html">1994/ldb &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1994/imc/imc.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Ian_Collier">Ian Collier</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>
<h2 id="to-use">To use:</h2>
<pre><code> ./imc number</code></pre>
<p>where <code>number</code> is an optional number. Default is 5.</p>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>This entry’s algorithm is as magic as its output!</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This program may be compiled with an ANSI or K&amp;R compiler. A few
harmless warnings are displayed only if <code>gcc -Wall</code> is used.</p>
<p>This entry is really a set of library functions, but an example
<code>main()</code> function has been added so that the library can be tested. If
the program appears too large, consider that functions <code>o()</code> and <code>s()</code> can
each be separated from the rest of the program (except for the short
functions <code>p()</code> and <code>r()</code>, which they require) and used alone. However, the
main part of the program is the function <code>e</code>, which does require all the
other functions (apart from <code>main()</code>).</p>
<p>The program should be supplied with an integer parameter. If no
parameter or an invalid parameter is given, then 5 is assumed. The
maximum parameter is determined only by the amount of CPU time, virtual
memory and display (or file) space available.</p>
<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
<p><strong>If you want a greater challenge, don’t read any further</strong>:
just try to understand the program via the source.</p>
<p>If you get stuck, come back and read below for additional hints and information.</p>
<h3 id="how-this-entry-works">How this entry works:</h3>
<p>OK, so you have probably seen magic square printers before. But what
about one that deals with even sizes as well as odd ones, or one that
prints out a different one each time (or attempts to, at any rate)?</p>
<p>I have formatted the important functions <code>o()</code>, <code>s()</code> and <code>e()</code> to show how useful
the word <code>for</code> is, and (in function <code>e()</code>) how useful the words <code>if</code> and
<code>else</code> are. In fact, hardly anything happens that isn’t in one of these
instructions. I did this in order to simplify the code - the algorithms
used to make the random squares are quite complex without being shrouded
in obfuscated code! :-) Incidentally, I was surprised to find out how
useful the exclusive-or operator was while writing function <code>s()</code>.</p>
<p>Here are the descriptions of the functions in the library:</p>
<blockquote>
<p><code>o(n,a,q,d)</code>: makes a magic square of order <code>n</code> when <code>n</code> is odd and at least 3.<br>
<code>s(n,a,q,d)</code>: makes a magic square of order <code>n</code> when <code>n</code> equals 4.<br>
<code>e(n,a,q,d)</code>: makes a magic square of order <code>n</code> when <code>n</code> is even and at least 6.</p>
</blockquote>
<p>In the above, <code>a</code> (of type <code>int *</code>) points to an area of memory in which
the magic square will be stored and <code>q</code> (also of type <code>int *</code>) points to
an area of memory of length at least <code>n*sizeof(int)</code> bytes which can be
used as a work space. Both <code>a</code> and <code>q</code> must be allocated by the caller.
The integer parameter <code>d</code>, usually zero, indicates the length of a gap
which will be left between adjacent rows of the magic square.</p>
<p>The square which is returned will (or should) be a permutation of the
numbers 1 to <code>n*n</code> in which all rows and columns and the two diagonals
add up to <code>n*(n*n+1)/2</code>.</p>
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<div id="inventory">
<h1 id="inventory-for-1994imc">Inventory for 1994/imc</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/imc.c">imc.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/imc.orig.c">imc.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1994_imc.tar.bz2">1994_imc.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1994/imc/.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/1994/imc/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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<div id="coda"><h3>Coda</h3>
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