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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 txt file in the server. </p>
<table border="1" align="center" cellpadding="2" cellspacing="1">
<tr bgcolor="#0066FF">
<td colspan="2"><div align="center" class="style1 style2 style5"><strong>"Program" Line</strong></div></td>
<td><div align="center" class="style3">Result</div></td>
</tr>
<?php
/* this example read a "RPN program file" (RPN.txt) and execute some actions
" " IS THE COMMAND SEPARATOR
NO SYMBOL FOR LINE END
RPN "PROGRAM" EQUIVALENT ALGEBRAIC OPERATIONS
Line 1: 2 12 + ····> 12 + 2 = 14
Line 2: 8 - 9 * ····> 14 - 8 = 6; 6 *9 = 54
Line 3: 5 / 78 5 + - ····> 54 / 5 = 10.8; 78 + 5 = 83; 10.8 - 83 = -72.2
Line 4: 25 10 * 50 + ····> 25 * 10 = 250; 250 + 50 = 300;
Line 5: DUP * ····> 300 * 300 = 90000
Line 6: SWAP - ····> 90000 - -72.2 = 90072.2
Line 7: 23 50 > IF + * 40 + then ····> 6575310.6
Try to change condition Line 7 to "<" . 23 50 > IF + * 40 + then ····> 90
because " + *" are not evaluated when condition is false
*/
require_once("rpn.class.php");
$s=&new RPNstack(); // pila como variable global
$ProgramFile = fopen("RPN.txt","r");
#READ A RPN COMMANDS FILE line by line
$num_lineas = 1;
while(!feof($ProgramFile)):
$buffer = trim(fgets($ProgramFile,4096));
?>
<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" ><?php echo $s->parse_line($buffer); ?></div></td>
</tr>
<?php
//echo "<br>"; $s->dump(); // this line is only for debuging
endwhile;
?>
</table>
<?php
printf("<h2>The Result is %s </h2>",$s->first());
?>
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