Fixes in html files and manifest from 2000
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@@ -428,8 +428,8 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
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the use of embedded language interpreters. The judges considered
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disqualifying this entry because of the use of perl, but on the other
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hand it qualifies as the Worst Abuse of the Rules. As a previous author,
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<a href="../../authors.html#J_David_Lowe">David Lowe</a> continues to inflict the highest quality “poot” on the
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Judges.</p>
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<a href="../../authors.html#J_David_Lowe">David Lowe</a> continues to inflict the highest
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quality “<code>poot</code>” on the Judges.</p>
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<p>The program also contains an undocumented command for Chad and Chongo (Landon).
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The judges’ remarks contain a clue to the hidden command :-).</p>
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<ul>
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@@ -445,25 +445,65 @@ calculator</a>, loosely
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based on the <code>dc(1)</code> unix calculator.</p>
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<h1 id="syntax">Syntax</h1>
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<p>This program understands the following <code>dc(1)</code> commands:</p>
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<pre><code> p prints the top stack value without altering the stack.
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P prints the top stack value, removing it from the stack, and
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doesn't print a trailing newline.
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f prints the contents of the stack, one number per line,
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without modifying it.
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c clears the stack.
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d pushes a copy of the top stack value onto the stack.
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r reverses the order of the top two stack values.</code></pre>
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<ul>
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<li><code>p</code>
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<ul>
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<li>prints the top stack value without altering the stack.</li>
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</ul></li>
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<li><code>P</code>
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<ul>
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<li>prints the top stack value, removing it from the stack, and
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doesn’t print a trailing newline.</li>
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</ul></li>
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<li><code>f</code>
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<ul>
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<li>prints the contents of the stack, one number per line,
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without modifying it.</li>
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</ul></li>
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<li><code>c</code>
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<ul>
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<li>clears the stack.</li>
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</ul></li>
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<li><code>d</code>
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<ul>
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<li>pushes a copy of the top stack value onto the stack.</li>
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</ul></li>
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<li><code>r</code>
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<ul>
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<li>reverses the order of the top two stack values.</li>
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</ul></li>
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</ul>
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<p>And the following arithmetic operators are supported:</p>
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<pre><code> + Pops 2 values and pushes their sum.
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- Pops 2 values and pushes the result of subtracting the first
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from the second.
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* Pops 2 values and pushes their product.
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/ Pops 2 values and pushes the result of dividing the second
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by the first.
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^ Pops 2 values and pushes the result of raising the second
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to the power of the first.
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% Pops 2 values and pushes the remainder of the division that
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/ would do.</code></pre>
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<ul>
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<li><code>+</code>
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<ul>
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<li>Pops 2 values and pushes their sum.</li>
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</ul></li>
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<li><code>-</code>
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<ul>
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<li>Pops 2 values and pushes the result of subtracting the first
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from the second.</li>
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</ul></li>
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<li><code>*</code>
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<ul>
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<li>Pops 2 values and pushes their product.</li>
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</ul></li>
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<li><code>/</code>
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<ul>
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<li>Pops 2 values and pushes the result of dividing the second
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by the first.</li>
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</ul></li>
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<li><code>^</code>
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<ul>
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<li>Pops 2 values and pushes the result of raising the second
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to the power of the first.</li>
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</ul></li>
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<li><code>%</code>
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<ul>
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<li>Pops 2 values and pushes the remainder of the division that
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<code>/</code> would do.</li>
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</ul></li>
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</ul>
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<p>The precision and range are double, like it or not, except that the
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modulus operator actually returns <code>(p1 - (p2 * (p1 / p2)))</code>, but with
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the innermost division calculated at integer precision. This is
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@@ -473,14 +513,26 @@ the command line. Unlike <code>dc(1)</code>, multiple commands on the same line
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must be space separated. Commands are only executed when a newline
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or EOF is encountered.</p>
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<h3 id="diagnostics">Diagnostics:</h3>
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<pre><code> "stack empty" Not enough on the stack for the requested command
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"divide by zero" Attempt to divide by zero
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"unimplemented" Invalid input
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Floating point exception (core dumped) (or something to that effect)
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Bug in Perl_sv_upgrade causes this in some cases when
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the results of an operation are really huge (> 10^308)
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This bug appears to be fixed in perl5.6.0</code></pre>
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<ul>
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<li>“stack empty”
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<ul>
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<li>Not enough on the stack for the requested command</li>
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</ul></li>
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<li>“divide by zero”
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<ul>
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<li>Attempt to divide by zero</li>
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</ul></li>
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<li>“unimplemented”
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<ul>
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<li>Invalid input</li>
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</ul></li>
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<li>“Floating point exception (core dumped)” (or something to that effect)
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<ul>
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<li>Bug in Perl_sv_upgrade causes this in some cases when the results of an
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operation are really huge (> 10^308) This bug appears to be fixed in
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perl5.6.0.</li>
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</ul></li>
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</ul>
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<h3 id="examples">Examples:</h3>
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<pre><code> $ echo '12 13 14 15 16 + + + + f' | ./dlowe
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70
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@@ -577,8 +629,8 @@ easier to remember, <code>=</code> is synonymous with <code>d</code>. This also
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possible to write (even more) obfuscated reverse Polish commands
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(I figure this explanation moves the synonyms from ‘bug’ to
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‘feature’!)</p></li>
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<li><p>The first IOCCC entry with an “easter egg”?…</p></li>
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</ul>
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<p>. The first IOCCC entry with an “easter egg”?…</p>
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<h3 id="aside-on-unobfuscated-perl">Aside: on unobfuscated Perl</h3>
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<p>My original intent was to write obfuscated C and crystal-clear Perl,
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to highlight my bending of the rules. Unfortunately, Perl really
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@@ -590,12 +642,13 @@ the list of qualifications for judges… Oh dear, I guess your C
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beautifier won’t help too much, either ;)</p>
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<p>If you don’t change the rules, it’ll be embedded Ada next year!</p>
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<h3 id="auto-defend">Auto defend</h3>
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<p>A. Isn’t this the obfuscated C contest? What’s this Perl <code>$#_&&$_</code>?</p>
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<p>D. Hey, this program <em>is</em> 100% C, and does not exec an external Perl
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<ol start="0" type="1">
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<li><p>Isn’t this the obfuscated C contest? What’s this Perl <code>$#_&&$_</code>?</p></li>
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<li><p>Hey, this program <em>is</em> 100% C, and does not exec an external Perl
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interpreter. It simply links against the Perl language library.
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The “Perl code” is just a C string constant.</p>
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<p>A. Perl isn’t portable enough, or ubiquitous enough.</p>
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<p>D. I’d argue that it is more portable than X. According to the Perl
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The “Perl code” is just a C string constant.</p></li>
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<li><p>Perl isn’t portable enough, or ubiquitous enough.</p></li>
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<li><p>I’d argue that it is more portable than X. According to the Perl
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folks, it runs on the following platforms: Acorn, AIX, Amiga, AS/400,
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BeOS, Concurrent, Debian, DEC OSF/1, Digital UNIX, EPOC, FreeBSD,
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Guardian, HP-UX, IRIX, LinuxPPC, LynxOS, MacOS, MachTen, Minix, MPE/iX,
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@@ -603,7 +656,8 @@ MS-DOS, MVS, NetBSD, Netware, NextStep, OpenBSD, OpenLinux, ODT, OpenVMS,
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OS/2, OS390, OSR, PowerMAX, Psion, QNX, Redhat, Reliant UNIX, RISCOS,
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SCO, SGI, SINIX, Slackware, Solaris, Sun, SuSE, Tandem, Tru64, UNIX,
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U/WIN, Unixware, VMS, Win31, Win32, Windows 3.1, and Windows 95/98/NT/2K.
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Granted, embeddable Perl isn’t quite so portable, but still…</p>
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Granted, embeddable Perl isn’t quite so portable, but still…</p></li>
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</ol>
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<p>Also, Perl 5 is bundled with the following OS distributions: AIX 4.3.3+,
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FreeBSD 3.0+, IRIX 6.4+, every Linux distribution, NetBSD, OpenBSD, and
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DEC Tru64 5.0+, again according to the Perl people.</p>
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