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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
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may easily view the original C code that was submitted for IOCCC judging.

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2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>1996/schweikh2 - Best algorithm</h2>
<h3>Search for a limited class of expressions that equal a constant</h3>
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<div class="navbar">
<a class="Left" href="../schweikh1/index.html">&larr; 1996/schweikh1</a>
<a class="Left" href="../index.html">&uarr; 1996 &uarr;</a>
<a class="Left" href="../schweikh3/index.html">1996/schweikh3 &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/schweikh2.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Jens_Schweikhardt">Jens Schweikhardt</a><br>
Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</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> ./schweikh2</code></pre>
<p>The program accepts up to 4 parameters:</p>
<ol start="0" type="1">
<li><p>The number of operators in the expression [default: 9]</p></li>
<li><p>The value of the first operand [default: 1]</p></li>
<li><p>The (possibly negative) increment to the next operand [default: 1]</p></li>
<li><p>The goal value or 0/0 [default: 42]</p></li>
</ol>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>What happens if you pass only three parameters like the below?</p>
<pre><code> ./schweikh2 15 1 0</code></pre>
<p>The author also suggests:</p>
<pre><code> while :; do grep -v &#39;#&#39; schweikh2.c; done</code></pre>
<p>(and we do too) which works with <code>sh</code>, <code>bash</code>, <code>ksh</code> and <code>zsh</code> as well. Press
ctrl-c to stop it. Observe how the <a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/try.sh">try.sh</a> script does this once to
make it easier to see what is happening.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The original program, with only slight obfuscations, may be found
in <a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/hunni.c">hunni.c</a>. The perl script, <a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/hunni.pl">hunni.pl</a>, obfuscates it
appropriately. Try:</p>
<pre><code> less hunni.c
perl ./hunni.pl &lt; hunni.c</code></pre>
<p><strong>NOTE</strong>: the <a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/try.sh">try.sh</a> script does this if you have
<code>perl(1)</code> installed to show how the output is the same as
<a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/schweikh2.c">schweikh2.c</a> itself.</p>
<p>This entry was another crowd pleaser at the <a href="../../faq.html#ioccc_bof">IOCCC
BOF</a>.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p><strong>NOTE</strong>: the source must be viewed with tabstop 8. To appreciate the
beauty have your eyes half closed.</p>
<h3 id="why-i-think-this-program-is-obfuscated">Why I think this program is obfuscated:</h3>
<p>C is a free format language. It is therefore a question of style how
variables, operators, declarations, functions and syntactic elements
like braces and parentheses are grouped together. As a rule of thumb,
I put spaces around operators, after opening braces and before closing
braces. I have generalized this rule by putting whitespace after <em>any</em>
non-white space character (with the exception of preprocessor directives).
There are no recognizable keywords anymore. There are no recognizable
string literals any more. The <code>main()</code> function is invisible. All operators
longer than one character are gone. They have been replaced by macro
calls with quite a number of arguments. The keys are the token pasting
and stringizing macros <code>e</code> and <code>O</code>. The “arcane rules of token pasting”
[K&amp;R2] are used up to three levels: <code>H(O,r)R(O,r)</code> (!) which is needed to make
one 8-character token from 8 characters (<code>unsigned</code>). BTW, C has no 9 or
more character reserved words, so a fourth level is only required if
you intend to generate object names from 9 or more components. The final
round even swaps the tokens, so all keywords must be spelled backwards
(sort of, can you spot <code>printf</code> in the <code>P</code> macro?).</p>
<p>Try to indent the source. The unbalanced parentheses confuse Solaris’
<code>indent</code> to the max (although the result does compile):</p>
<p>Looking at the indented source is even <em>less</em> fun, because the nice
diamond pattern has been replaced by something that looks like, uhm,
modem noise.</p>
<p>Lint the source. It’s clean. How obfuscated…</p>
<p>What’s the exit status? The program exits with <code>J - 1</code> where <code>J</code> is the
return value from several non-void functions (needed to shut up
lint). The last assignment is <code>J = printf ("%c", 10);</code> so the exit
status is <code>0</code> unless the last <code>printf</code> failed, which is even a <em>useful</em>
status. A further obfuscation is the use of <code>10</code> instead of <code>'\n'</code>.
<code>'\n'</code> can not be constructed by token pasting, AFAIK. That’s why <code>schweikh2</code>
is likely to produce occasional garbage on non-ASCII execution character
set systems.</p>
<h3 id="what-this-program-does">What this program does</h3>
<p>The program is an expression evaluator for a limited class of expressions. Known
operators are <code>+</code> <code>-</code> <code>*</code> <code>/</code>; operands are real numbers (integers or
fractions). The operands are restricted in that they must differ by a constant
value, for example <code>1 + 2 * 3 / 4 - 5</code>. For any combination of operators the
expression is evaluated and compared to a goal value. If they compare equal the
expression is printed. If the goal value is specified as <code>0/0</code> all expressions
and results are printed. For any fraction, the numerator and denominator are
divided by their greatest common divisor.</p>
<p>The program accepts up to 4 parameters:</p>
<ol type="1">
<li>The number of operators in the expression [default: 9].</li>
<li>The value of the first operand [1].</li>
<li>The (possibly negative) increment to the next operand [1].</li>
<li>The goal value or 0/0 [42].</li>
</ol>
<p>On ANSI/ISO C conformant systems (where <code>long</code> is at least 32 bits)
overflow will occur in the default case (first operand 1, increment 1)
only for more than 11 operators. Because a bit mask is used that needs
twice the number of operands in bits (plus a sentinel value) on those
systems the first parameter must not exceed 15.</p>
<p>If <code>long</code> is at least 64 bits overflow will occur for more than 19
operators but you will probably wait quite some time for every of the
<code>4^19 = 274,877,906,944</code> combinations to be evaluated… While I’m at it,
on a 50 MHz SPARC, <code>4^11</code> expressions are evaluated in about 3 cpu
minutes (<code>gcc -O3</code>).</p>
<h3 id="sample-arguments">Sample arguments:</h3>
<pre><code> ./schweikh2 6
./schweikh2 7 0
./schweikh2 7 7 0
./schweikh2 8 9 -1 -67/21
./schweikh2 8 2 2/5 -98/25
./schweikh2 2 1/0 1 1/0</code></pre>
<h3 id="miscellaneous">Miscellaneous</h3>
<p>The diamond pattern can be continued without a break.
For a nice printout try this on your Bourne compatible shell:</p>
<pre><code> while :; do grep -v &#39;#&#39; schweikh2.c; done</code></pre>
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<h1 id="inventory-for-1996schweikh2">Inventory for 1996/schweikh2</h1>
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<h2 id="primary-files">Primary files</h2>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/schweikh2.c">schweikh2.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/hunni.c">hunni.c</a> - original slightly obfuscated source</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/hunni.pl">hunni.pl</a> - perl script to obfuscate original code hunni.c</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="1996_schweikh2.tar.bz2">1996_schweikh2.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1996/schweikh2/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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