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<span class="style5 style1"><a href="index.html"><tt>PhpSqlAsp.com</tt></a> <tt><a href="rpn.html">RPN Interpreter (NEW)</a></tt> </span>
<h1 align="center">EXAMPLE OF<br />
<span class="style4">RPN INTERPRETER IN PHP</span> </h1>
<h3>(C) Arturo Gonzalez-Mata Santana </h3>
<p>This example read and execute a RPN commands in the form. </p>
<?php
require_once("rpn.class.php");
$s=&new RPNstack(); // pila como variable global
//echo nl2br($_POST["textarea"]); // only for
$num_lineas=1;
$program = $_POST["textarea"] . " ";
if ($program == "") : echo "<center><h3>please write or edit a program</h3></center>";
else :
?>
<table border="1" align="center" cellpadding="2" cellspacing="1">
<tr bgcolor="#0066FF">
<td colspan="2"><div align="center" class="style5"><strong>"Program" Line</strong></div></td>
<td><div align="center" class="style3">Result</div></td>
</tr>
<?php
$listado = explode("\n",$program);
foreach ($listado as $buffer) {
?><tr>
<td bgcolor="#FFCC99"><div align="center" class="style5">#<?php echo $num_lineas++;?></div></td>
<td bgcolor="#FFCC99"><span class="style7"><?php echo $buffer;?></span></td>
<td bgcolor="#003300"><div align="right" class="style8"><strong><?php echo $s->parse_line($buffer); ?></strong></div></td>
</tr>
<?php } //foreach
endif; ?>
</table>
<?php
if ($s->first() != "") printf("<h2>The Result is %s </h2>",$s->first());
?>
<form name="form1" id="form1" method="post" action="">
<table border="1" align="center" cellpadding="0" cellspacing="2">
<tr>
<td width="505">
<textarea name="textarea" cols="80" rows="24" class="style5"><?php
if ($_POST["textarea"] != "") echo $_POST["textarea"]; else echo "2 12 +
8 - 9 *
5 / 78 5 + -
25 10 * 50 +
DUP *
SWAP -
23 50 < IF + * then 40 +" ;?></textarea>
</td>
<td width="145" valign="top"><h3 align="center">
<input type="submit" name="Submit" value="Submit" />
<input name="Clear" type="reset" id="Clear2" value="Reset" />
</h3>
<table width="95%" border="1" cellspacing="2" cellpadding="0">
<tr>
<th bgcolor="#003300" class="style5" scope="col"><h5 class="style8">RPN<br />
COMMANDS </h5></th>
</tr>
<tr>
<td class="style5"><span class="style9"><strong>Math Operators:</strong><br />
+ - * / </span></td>
</tr>
<tr>
<td class="style5"><span class="style9"><strong>Comparison Operators:</strong><br />
= <> > < >= <= </span></td>
</tr>
<tr>
<td class="style5"><p class="style9"><strong>Conditionals:<br />
</strong>IF .. THEN </p> </td>
</tr>
<tr>
<td class="style5"><p class="style9"><strong>Stack:</strong><br />
DUP SWAP
</p> </td>
</tr>
</table> <p align="center" class="style5"> </p>
<p class="style5"> </p><p> </p></td>
</tr>
</table>
</form>
<p> </p>
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