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Landon Curt Noll 11dfe51c6c move IOCCC Quick Start Guide
Created `quick-start.md` to hold the FAQ 0.0 content.

Used `sgit(1)` to change:

* faq.html#enter ==> quick-start.html#enter
* faq.html#enter_questions ==> quick-start.html#enter_questions
* faq.html#step_0 ==> quick-start.html#step_0
* faq.html#step_1 ==> quick-start.html#step_1
* faq.html#step_2 ==> quick-start.html#step_2
* faq.html#register ==> quick-start.html#register
* faq.html#step_3 ==> quick-start.html#step_3
* faq.html#step_4 ==> quick-start.html#step_4
* faq.html#step_5 ==> quick-start.html#step_5
* faq.html#step_6 ==> quick-start.html#step_6
* faq.html#step_7 ==> quick-start.html#step_7
* faq.html#step_submit ==> quick-start.html#step_submit

Via:

```sh
sgit -e 's/faq\.html#enter/quick-start.html#enter/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#enter_questions/quick-start.html#enter_questions/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_0/quick-start.html#step_0/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_1/quick-start.html#step_1/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_2/quick-start.html#step_2/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#register/quick-start.html#register/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_3/quick-start.html#step_3/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_4/quick-start.html#step_4/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_5/quick-start.html#step_5/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_6/quick-start.html#step_6/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_7/quick-start.html#step_7/g' '*.md' '*.hdr' 'inc/*.html'
sgit -e 's/faq\.html#step_submit/quick-start.html#step_submit/g' '*.md' '*.hdr' 'inc/*.html'
```

The former FAQ 0.0 section in `faq.html` now just refers to `quick-start.html`.

Modified menu and non-JS menu so that "Enter the IOCCC" refers to `quick-start.html`.

Changed `bin/gen-top-html.sh` VERSION from "1.4.10 2024-11-23"
to "1.4.11 2025-01-09".

Performed `make www` on macOS to complete the above.
2025-01-09 23:11:43 -08:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>1993/vanb - Most irregular expression</h2>
<h3>calculator that prints in octal</h3>
</div>
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<a class="Left" href="../index.html">&uarr; 1993 &uarr;</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/1993/vanb/vanb.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#David_Van_Brackle">David Van Brackle</a><br>
Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#1993_vanb">1993/vanb in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./vanb &#39;exp&#39;</code></pre>
<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>
<pre><code> ./try.sh</code></pre>
<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>
<ul>
<li>unary operators: <code>+</code>, <code>-</code></li>
<li>binary operators: <code>+</code>, <code>-</code>, <code>*</code>, <code>/</code>, <code>%</code></li>
<li>hex numbers: <code>x</code> or <code>X</code> followed by hex digits</li>
<li>decimal numbers: <code>d</code> or <code>D</code> followed by decimal digits</li>
<li>octal numbers: octal digits</li>
<li>grouping: <code>()</code></li>
</ul>
<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>
<pre><code> #define O5 main
O5(O2,O7,O3)char**O7;
{
return
/* N1 */ !(O2+=~01+01) ?\
00:
/* N2 */ !(O2-=02&gt;01) ?\
printf(&quot;\045\157\012&quot;,O5(012,O7+01,00)):
/* O */ !(O2-=02&gt;&gt;01) ?\
(**O7&lt;=067 &amp;&amp; **O7&gt;057 ? O5(03,O7,*(*O7)++-060+010*O3):O3):
/* D */ !(O2-=-O3-~O3) ?\
(072&gt;**O7 &amp;&amp; 060&lt;=**O7 ? O5(04,O7,012*O3-060+*(*O7)++):O3):
/* X */ !(O2-=!O3+!!O3) ?\
(**O7&gt;057 &amp;&amp; **O7&lt;=071 ? O5(05,O7,*(*O7)+++O3*020-060):
**O7&lt;=0106 &amp;&amp; 0101&lt;=**O7 ? O5(05,O7,020*O3+*(*O7)++-067):
0140&lt;**O7 &amp;&amp; **O7&lt;0147 ? O5(05,O7,-0127+*(*O7)+++020*O3):O3):
/* F */ !(O2-=02-01) ?\
(**O7==050 ? 050**++*O7,O5(013,O7,O5(012,O7,00)):
**O7&lt;056 &amp;&amp; 054&lt;**O7 ? 055**++*O7,-O5(06,O7,00):
054&gt;**O7 &amp;&amp; 052&lt;**O7 ? 050**(*O7)++,O5(06,O7,00):
!(**O7^0170)||!(0130^**O7) ? *++*O7,O5(05,O7,00):
**O7==0144||**O7==0104 ? ++*O7,O5(04,O7,00):O5(03,O7,00)):
/* T&#39; */ !--O2 ?\
(**O7==052 ? O5(07,O7,O3*(*++*O7,O5(06,O7,00))):
!(045-**O7) ? O5(07,O7,O3%(03+(*O7)++,O5(06,O7,00))):
!(**O7^057) ? O5(07,O7,O3/(03-*++*O7,O5(06,O7,00))):O3):
/* T */ !(O2+=01-02) ?\
O5(07,O7,O5(06,O7,00)):
/* E&#39; */ !(O2+=-02/02) ?\
(!(**O7-053)?O5(011,O7,O3+(++*O7,O5(010,O7,00))):
!(055^**O7) ? O5(011,O7,O3-(03+*(*O7)++,O5(010,O7,00))):O3):
/* E */ !(O2-=0563&amp;0215) ?\
O5(011,O7,O5(010,O7,00)):
/* C */ (++*O7,O3);
}</code></pre>
<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>
<pre><code> int e(){ return eprime( t() ); }</code></pre>
<p>The <code>E'</code> and <code>T'</code> states work like this:</p>
<pre><code> int eprime( int intermediate )
{
if( ch == &#39;+&#39; )
{
ch = nextchar();
return eprime( intermediate + t() );
}
else return intermediate;
}</code></pre>
<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>
<pre><code> int octal( int intermediate )
{
if( ch&gt;=&#39;0&#39; &amp;&amp; ch&lt;=&#39;7&#39; )
{
intermediate = intermediate * 8 + ch - &#39;0&#39;;
ch = nextchar();
return octal( intermediate );
}
else return intermediate;
}</code></pre>
<p><code>F</code> and <code>C</code> work similarly.</p>
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<h1 id="inventory-for-1993vanb">Inventory for 1993/vanb</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/vanb/vanb.c">vanb.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/vanb/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/vanb/vanb.alt.c">vanb.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/1993/vanb/vanb.orig.c">vanb.orig.c</a> - original source code</li>
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<li><a href="1993_vanb.tar.bz2">1993_vanb.tar.bz2</a> - download entry tarball</li>
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<div id="coda"><h3>Coda</h3>
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