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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
<h1>The International Obfuscated C Code Contest</h1>
<h2>1993/vanb - Most Irregular Expression</h2>
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<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#David_Van_Brackle">David Van Brackle</a><br>
Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em>
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<h2 id="to-build">To build:</h2>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> all</span></code></pre></div>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a href="../../bugs.html#1993_vanb">1993 vanb bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./vanb</span> <span class="st">&#39;exp&#39;</span></span></code></pre></div>
<p>where <code>exp</code> is an octal expression. See below for how it can also have
hexadecimal and decimal numbers.</p>
<h2 id="try">Try:</h2>
<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
<p>What happens if you use something other than valid digits?</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>The octal expression may contain:</p>
<pre><code>unary operators: +, -
binary operators +, -, *, /, %
hex numbers: x or X followed by hex digits
decimal numbers: d or D followed by decimal digits
octal numbers: octal digits
grouping: ()</code></pre>
<p>No spaces are allowed in the expression. To avoid shell expansion,
one should surround the expression in single quotes.</p>
<p>It is a good thing that this program consists of only one
expression, otherwise it might become hard to understand. :-)</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>The program does no error checking - erroneous expressions will
produce spurious results. Note that unary <code>-</code> is an operator. Thus,
decimal <code>-46</code> would be entered as <code>-d46</code> and not <code>d-46</code>.</p>
<h3 id="what-makes-this-program-special">What Makes This Program Special:</h3>
<ol start="0" type="1">
<li><p>Of course, the fact that the program takes input and produces output in
octal, rather than a more useful system like decimal, makes it “special”.</p></li>
<li><p>The entire program consists of a single expression, returned from <code>main()</code>.</p></li>
<li><p>There are no global or local variables other than the parameters to <code>main()</code>.</p></li>
<li><p>All of the constants in the program are expressed in octal - including the
<code>printf(3)</code> string.</p></li>
<li><p>The variables are given names which cause visual confusion with the octal
constants.</p></li>
<li><p>The program is formatted like a Roman numeral 8. The significance of 8 is
obvious. I chose Roman numerals because it is a numbering system even more
arcane than octal. It’s not very ‘deceptive’, but it’s difficult to deceptively
format a program which has no explicit control structures (other than <code>?:</code>s).</p></li>
<li><p>Many simple tasks are done many times. I tried to do these differently each
time, to make the program harder to understand.</p></li>
</ol>
<h3 id="how-it-works">How It Works:</h3>
<p>It’s a recursive descent parser, calling <code>main()</code>
for all of its recursion. <code>O2</code> is a state variable, telling <code>main()</code>
what grammar non-terminal to parse. <code>**O7</code> is the next character.
<code>O3</code> is an intermediate result. Whenever you see a construct like:</p>
<pre><code>!(expression with O2)?</code></pre>
<p>it’s decrementing and testing <code>O2</code> to see what state it’s in. Comparisons
involving <code>**O7</code> and octal constants are looking for certain characters.</p>
<p>Here’s the grammar (<code>'e'</code> denotes the empty string) :</p>
<pre><code>&lt;E&gt; ::= &lt;T&gt;&lt;E&#39;&gt;
&lt;E&#39;&gt; ::= +&lt;T&gt;&lt;E&#39;&gt; | -&lt;T&gt;&lt;E&#39;&gt; | e
&lt;T&gt; ::= &lt;F&gt;&lt;T&#39;&gt;
&lt;T&#39;&gt; ::= *&lt;F&gt;&lt;T&#39;&gt; | /&lt;F&gt;&lt;T&#39;&gt; | %&lt;F&gt;&lt;T&#39;&gt; | e
&lt;F&gt; ::= +&lt;F&gt; | -&lt;F&gt; | (&lt;E&gt;&lt;C&gt; | d&lt;D&gt; | D&lt;D&gt; | x&lt;X&gt; | X&lt;X&gt; | &lt;O&gt;
&lt;C&gt; ::= )
&lt;D&gt; ::= [0-9]&lt;D&gt; | e
&lt;X&gt; ::= [0-9]&lt;X&gt; | [A-F]&lt;X&gt; | [a-f]&lt;X&gt; | e
&lt;O&gt; ::= [0-7]&lt;O&gt; | e</code></pre>
<p>Here’s how the grammar nonterminals map to octal state numbers:</p>
<pre><code>&lt;E&gt; is 012
&lt;E&#39;&gt; is 011
&lt;T&gt; is 010
&lt;T&#39;&gt; is 07
&lt;F&gt; is 06
&lt;C&gt; is 013
&lt;D&gt; is 04
&lt;X&gt; is 05
&lt;O&gt; is 03</code></pre>
<p>Here’s a version of the program before it got formatted into the VIII,
augmented with comments showing where each state begins. <code>N1</code> and <code>N2</code> are
notes:</p>
<div class="sourceCode" id="cb9"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#define O5 main</span></span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a>O5<span class="op">(</span>O2<span class="op">,</span>O7<span class="op">,</span>O3<span class="op">)</span><span class="dt">char</span><span class="op">**</span>O7<span class="op">;</span></span>
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a><span class="op">{</span></span>
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span></span>
<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a><span class="co">/* N1 */</span> <span class="op">!(</span>O2<span class="op">+=~</span><span class="bn">01</span><span class="op">+</span><span class="bn">01</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a> <span class="bn">00</span><span class="op">:</span></span>
<span id="cb9-7"><a href="#cb9-7" aria-hidden="true" tabindex="-1"></a><span class="co">/* N2 */</span> <span class="op">!(</span>O2<span class="op">-=</span><span class="bn">02</span><span class="op">&gt;</span><span class="bn">01</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-8"><a href="#cb9-8" aria-hidden="true" tabindex="-1"></a> printf<span class="op">(</span><span class="st">&quot;</span><span class="sc">\045</span><span class="er">\1</span><span class="st">57</span><span class="sc">\012</span><span class="st">&quot;</span><span class="op">,</span>O5<span class="op">(</span><span class="bn">012</span><span class="op">,</span>O7<span class="op">+</span><span class="bn">01</span><span class="op">,</span><span class="bn">00</span><span class="op">)):</span></span>
<span id="cb9-9"><a href="#cb9-9" aria-hidden="true" tabindex="-1"></a><span class="co">/* O */</span> <span class="op">!(</span>O2<span class="op">-=</span><span class="bn">02</span><span class="op">&gt;&gt;</span><span class="bn">01</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-10"><a href="#cb9-10" aria-hidden="true" tabindex="-1"></a> <span class="op">(**</span>O7<span class="op">&lt;=</span><span class="bn">067</span> <span class="op">&amp;&amp;</span> <span class="op">**</span>O7<span class="op">&gt;</span><span class="bn">057</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">03</span><span class="op">,</span>O7<span class="op">,*(*</span>O7<span class="op">)++-</span><span class="bn">060</span><span class="op">+</span><span class="bn">010</span><span class="op">*</span>O3<span class="op">):</span>O3<span class="op">):</span></span>
<span id="cb9-11"><a href="#cb9-11" aria-hidden="true" tabindex="-1"></a><span class="co">/* D */</span> <span class="op">!(</span>O2<span class="op">-=-</span>O3<span class="op">-~</span>O3<span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-12"><a href="#cb9-12" aria-hidden="true" tabindex="-1"></a> <span class="op">(</span><span class="bn">072</span><span class="op">&gt;**</span>O7 <span class="op">&amp;&amp;</span> <span class="bn">060</span><span class="op">&lt;=**</span>O7 <span class="op">?</span> O5<span class="op">(</span><span class="bn">04</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">012</span><span class="op">*</span>O3<span class="op">-</span><span class="bn">060</span><span class="op">+*(*</span>O7<span class="op">)++):</span>O3<span class="op">):</span></span>
<span id="cb9-13"><a href="#cb9-13" aria-hidden="true" tabindex="-1"></a><span class="co">/* X */</span> <span class="op">!(</span>O2<span class="op">-=!</span>O3<span class="op">+!!</span>O3<span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-14"><a href="#cb9-14" aria-hidden="true" tabindex="-1"></a> <span class="op">(**</span>O7<span class="op">&gt;</span><span class="bn">057</span> <span class="op">&amp;&amp;</span> <span class="op">**</span>O7<span class="op">&lt;=</span><span class="bn">071</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">05</span><span class="op">,</span>O7<span class="op">,*(*</span>O7<span class="op">)+++</span>O3<span class="op">*</span><span class="bn">020</span><span class="op">-</span><span class="bn">060</span><span class="op">):</span></span>
<span id="cb9-15"><a href="#cb9-15" aria-hidden="true" tabindex="-1"></a> <span class="op">**</span>O7<span class="op">&lt;=</span><span class="bn">0106</span> <span class="op">&amp;&amp;</span> <span class="bn">0101</span><span class="op">&lt;=**</span>O7 <span class="op">?</span> O5<span class="op">(</span><span class="bn">05</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">020</span><span class="op">*</span>O3<span class="op">+*(*</span>O7<span class="op">)++-</span><span class="bn">067</span><span class="op">):</span></span>
<span id="cb9-16"><a href="#cb9-16" aria-hidden="true" tabindex="-1"></a> <span class="bn">0140</span><span class="op">&lt;**</span>O7 <span class="op">&amp;&amp;</span> <span class="op">**</span>O7<span class="op">&lt;</span><span class="bn">0147</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">05</span><span class="op">,</span>O7<span class="op">,-</span><span class="bn">0127</span><span class="op">+*(*</span>O7<span class="op">)+++</span><span class="bn">020</span><span class="op">*</span>O3<span class="op">):</span>O3<span class="op">):</span></span>
<span id="cb9-17"><a href="#cb9-17" aria-hidden="true" tabindex="-1"></a><span class="co">/* F */</span> <span class="op">!(</span>O2<span class="op">-=</span><span class="bn">02</span><span class="op">-</span><span class="bn">01</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-18"><a href="#cb9-18" aria-hidden="true" tabindex="-1"></a> <span class="op">(**</span>O7<span class="op">==</span><span class="bn">050</span> <span class="op">?</span> <span class="bn">050</span><span class="op">**++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">013</span><span class="op">,</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">012</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">)):</span></span>
<span id="cb9-19"><a href="#cb9-19" aria-hidden="true" tabindex="-1"></a> <span class="op">**</span>O7<span class="op">&lt;</span><span class="bn">056</span> <span class="op">&amp;&amp;</span> <span class="bn">054</span><span class="op">&lt;**</span>O7 <span class="op">?</span> <span class="bn">055</span><span class="op">**++*</span>O7<span class="op">,-</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">):</span></span>
<span id="cb9-20"><a href="#cb9-20" aria-hidden="true" tabindex="-1"></a> <span class="bn">054</span><span class="op">&gt;**</span>O7 <span class="op">&amp;&amp;</span> <span class="bn">052</span><span class="op">&lt;**</span>O7 <span class="op">?</span> <span class="bn">050</span><span class="op">**(*</span>O7<span class="op">)++,</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">):</span></span>
<span id="cb9-21"><a href="#cb9-21" aria-hidden="true" tabindex="-1"></a> <span class="op">!(**</span>O7<span class="op">^</span><span class="bn">0170</span><span class="op">)||!(</span><span class="bn">0130</span><span class="op">^**</span>O7<span class="op">)</span> <span class="op">?</span> <span class="op">*++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">05</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">):</span></span>
<span id="cb9-22"><a href="#cb9-22" aria-hidden="true" tabindex="-1"></a> <span class="op">**</span>O7<span class="op">==</span><span class="bn">0144</span><span class="op">||**</span>O7<span class="op">==</span><span class="bn">0104</span> <span class="op">?</span> <span class="op">++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">04</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">):</span>O5<span class="op">(</span><span class="bn">03</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">)):</span></span>
<span id="cb9-23"><a href="#cb9-23" aria-hidden="true" tabindex="-1"></a><span class="co">/* T&#39; */</span> <span class="op">!--</span>O2 <span class="op">?</span>\</span>
<span id="cb9-24"><a href="#cb9-24" aria-hidden="true" tabindex="-1"></a> <span class="op">(**</span>O7<span class="op">==</span><span class="bn">052</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">07</span><span class="op">,</span>O7<span class="op">,</span>O3<span class="op">*(*++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">))):</span></span>
<span id="cb9-25"><a href="#cb9-25" aria-hidden="true" tabindex="-1"></a> <span class="op">!(</span><span class="bn">045</span><span class="op">-**</span>O7<span class="op">)</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">07</span><span class="op">,</span>O7<span class="op">,</span>O3<span class="op">%(</span><span class="bn">03</span><span class="op">+(*</span>O7<span class="op">)++,</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">))):</span></span>
<span id="cb9-26"><a href="#cb9-26" aria-hidden="true" tabindex="-1"></a> <span class="op">!(**</span>O7<span class="op">^</span><span class="bn">057</span><span class="op">)</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">07</span><span class="op">,</span>O7<span class="op">,</span>O3<span class="op">/(</span><span class="bn">03</span><span class="op">-*++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">))):</span>O3<span class="op">):</span></span>
<span id="cb9-27"><a href="#cb9-27" aria-hidden="true" tabindex="-1"></a><span class="co">/* T */</span> <span class="op">!(</span>O2<span class="op">+=</span><span class="bn">01</span><span class="op">-</span><span class="bn">02</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-28"><a href="#cb9-28" aria-hidden="true" tabindex="-1"></a> O5<span class="op">(</span><span class="bn">07</span><span class="op">,</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">06</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">)):</span></span>
<span id="cb9-29"><a href="#cb9-29" aria-hidden="true" tabindex="-1"></a><span class="co">/* E&#39; */</span> <span class="op">!(</span>O2<span class="op">+=-</span><span class="bn">02</span><span class="op">/</span><span class="bn">02</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-30"><a href="#cb9-30" aria-hidden="true" tabindex="-1"></a> <span class="op">(!(**</span>O7<span class="op">-</span><span class="bn">053</span><span class="op">)?</span>O5<span class="op">(</span><span class="bn">011</span><span class="op">,</span>O7<span class="op">,</span>O3<span class="op">+(++*</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">010</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">))):</span></span>
<span id="cb9-31"><a href="#cb9-31" aria-hidden="true" tabindex="-1"></a> <span class="op">!(</span><span class="bn">055</span><span class="op">^**</span>O7<span class="op">)</span> <span class="op">?</span> O5<span class="op">(</span><span class="bn">011</span><span class="op">,</span>O7<span class="op">,</span>O3<span class="op">-(</span><span class="bn">03</span><span class="op">+*(*</span>O7<span class="op">)++,</span>O5<span class="op">(</span><span class="bn">010</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">))):</span>O3<span class="op">):</span></span>
<span id="cb9-32"><a href="#cb9-32" aria-hidden="true" tabindex="-1"></a><span class="co">/* E */</span> <span class="op">!(</span>O2<span class="op">-=</span><span class="bn">0563</span><span class="op">&amp;</span><span class="bn">0215</span><span class="op">)</span> <span class="op">?</span>\</span>
<span id="cb9-33"><a href="#cb9-33" aria-hidden="true" tabindex="-1"></a> O5<span class="op">(</span><span class="bn">011</span><span class="op">,</span>O7<span class="op">,</span>O5<span class="op">(</span><span class="bn">010</span><span class="op">,</span>O7<span class="op">,</span><span class="bn">00</span><span class="op">)):</span></span>
<span id="cb9-34"><a href="#cb9-34" aria-hidden="true" tabindex="-1"></a><span class="co">/* C */</span> <span class="op">(++*</span>O7<span class="op">,</span>O3<span class="op">);</span></span>
<span id="cb9-35"><a href="#cb9-35" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p>Note <code>N1</code>: It should never enter this state, unless the user invokes the
program with no parameters, in which case it just returns 0.</p>
<p>Note <code>N2</code>: Since the program is properly invoked with 1 parameter, this is
the first state it will go into. This state just invokes
printf, and sends the parser to state <code>012</code> (which is <code>&lt;E&gt;</code>).</p>
<p>The <code>E</code> and <code>T</code> states work like this:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> e<span class="op">(){</span> <span class="cf">return</span> eprime<span class="op">(</span> t<span class="op">()</span> <span class="op">);</span> <span class="op">}</span></span></code></pre></div>
<p>The <code>E'</code> and <code>T'</code> states work like this:</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> eprime<span class="op">(</span> <span class="dt">int</span> intermediate <span class="op">)</span></span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="op">{</span></span>
<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span><span class="op">(</span> ch <span class="op">==</span> <span class="ch">&#39;+&#39;</span> <span class="op">)</span></span>
<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a> <span class="op">{</span></span>
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true" tabindex="-1"></a> ch <span class="op">=</span> nextchar<span class="op">();</span></span>
<span id="cb11-6"><a href="#cb11-6" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> eprime<span class="op">(</span> intermediate <span class="op">+</span> t<span class="op">()</span> <span class="op">);</span></span>
<span id="cb11-7"><a href="#cb11-7" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb11-8"><a href="#cb11-8" aria-hidden="true" tabindex="-1"></a> <span class="cf">else</span> <span class="cf">return</span> intermediate<span class="op">;</span></span>
<span id="cb11-9"><a href="#cb11-9" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p>The <code>D</code>, <code>X</code> and <code>O</code> states work like this (they assume that they’re initially
called with <code>0</code>):</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="dt">int</span> octal<span class="op">(</span> <span class="dt">int</span> intermediate <span class="op">)</span></span>
<span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a><span class="op">{</span></span>
<span id="cb12-3"><a href="#cb12-3" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span><span class="op">(</span> ch<span class="op">&gt;=</span><span class="ch">&#39;0&#39;</span> <span class="op">&amp;&amp;</span> ch<span class="op">&lt;=</span><span class="ch">&#39;7&#39;</span> <span class="op">)</span></span>
<span id="cb12-4"><a href="#cb12-4" aria-hidden="true" tabindex="-1"></a> <span class="op">{</span></span>
<span id="cb12-5"><a href="#cb12-5" aria-hidden="true" tabindex="-1"></a> intermediate <span class="op">=</span> intermediate <span class="op">*</span> <span class="dv">8</span> <span class="op">+</span> ch <span class="op">-</span> <span class="ch">&#39;0&#39;</span><span class="op">;</span></span>
<span id="cb12-6"><a href="#cb12-6" aria-hidden="true" tabindex="-1"></a> ch <span class="op">=</span> nextchar<span class="op">();</span></span>
<span id="cb12-7"><a href="#cb12-7" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> octal<span class="op">(</span> intermediate <span class="op">);</span></span>
<span id="cb12-8"><a href="#cb12-8" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb12-9"><a href="#cb12-9" aria-hidden="true" tabindex="-1"></a> <span class="cf">else</span> <span class="cf">return</span> intermediate<span class="op">;</span></span>
<span id="cb12-10"><a href="#cb12-10" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><code>F</code> and <code>C</code> work similarly.</p>
<h2 id="copyright-and-cc-by-sa-4.0-license">Copyright and CC BY-SA 4.0 License:</h2>
<p>This file is Copyright (c) 2023 by Landon Curt Noll. All Rights Reserved.
You are free to share and adapt this file under the terms of this license:</p>
<pre><code>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</code></pre>
<p>For more information, see: https://creativecommons.org/licenses/by-sa/4.0/</p>
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<h1 id="inventory-for-1993vanb"><a name="inventory"></a>Inventory for 1993/vanb</h1>
<p><a href="#top">Jump to top</a></p>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.c">vanb.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.alt.c">vanb.alt.c</a> - alternative source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.orig.c">vanb.orig.c</a> - original source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/try.sh">try.sh</a> - how to run</li>
<li><a href="1993_vanb.tar.bz2">1993_vanb.tar.bz2</a> - download entry source</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="index.html">index.html</a> - entry home page</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/README.md">README.md</a> - markdown source for index.html</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/.entry.json">.entry.json</a> - description of entry in JSON</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href=".path">.path</a> - directory path from top directory</li>
</ul>
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<h2>Coda</h2>
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F1993%2Fvanb%2Findex.html">Nu HTML check this web page</a></p>
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