[PHP] Calculadora em php

por **# Henrick-** Qua Out 21, 2009 10:38 pm

Achei um código muito bom para criar uma simples calculadora em php.

Código:: <?php //////////////////////////// //// Calculadora em PHP //// /// by henrick1234 /// // <bestdowns.forumeiros.com> // //////////////////////////// ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Calculadora criada por henrick1234</title> <style type="text/css"> td { color: #FFFF00; font-weight: bold; text-align: center; border: 1px solid #000099; } input#calc { background-color: #759475; text-align: right; color: #222722; border-color: #000099; } table#calculadora { border: 1px solid #000099; background-color: #3300cc; } #titulo { font-family: arial, verdana, sans serif; font-size: 1em; font-weight: bold; text-align: center; } </style> </head> <body> <?php class calculadora { var $nums = ''; var $calc = ''; var $op = ''; function mostrar () { $num = @$_GET['num'][0]; $calc = @$_GET['calc']; if(empty( $num ) AND empty( $calc )) { return false; } if(!isset( $display )) { $display = $calc; } $this->nums .= empty( $num ) ? $display : $display.$num; $this->setOperacao(); if(!empty( $this->op )) { $this->calc = $this->nums.rawurldecode( $this->op ).$num; } return $this->calcular(); } function setOperacao () { if(!empty( $_GET['op'] )) { $this->op = $_GET['op']; } } function calcular() { $calc = empty( $this->calc ) ? $this->nums : $this->calc; if(isset( $_GET['resultado'] )) { if(preg_match( '/^([0-9]+)(\/|\*|\+|\-)([0-9]+)+$/', $calc, $match )) { switch( $match[2] ) { case "+": return $match[1]+$match[3]; break; case "-": return $match[1]-$match[3]; break; case "/": return $match[1]/$match[3]; break; case "*": return $match[1]*$match[3]; break; } } else { return "Ocorreu um erro"; } } return $calc; } } $calc = new calculadora(); ?> <form action="" method="get">  <table id="calculadora" cellpadding="10" cellspacing="0" align="center"> <tr> <td align="center" colspan="4"> <span id="titulo">Calculadora</span><br/> <input id="calc" type="text" name="calc" value="<?=$calc->mostrar();?>" /> </td> </tr> <tr> <td> <input type="submit" name="num[]" value="7" /> </td> <td> <input type="submit" name="num[]" value="8" /> </td> <td> <input type="submit" name="num[]" value="9" /> </td> <td> <input type="submit" name="op" value="/" /> </td> </tr> <tr> <td> <input type="submit" name="num[]" value="4" /> </td> <td> <input type="submit" name="num[]" value="5" /> </td> <td> <input type="submit" name="num[]" value="6" /> </td> <td> <input type="submit" name="op" value="*" /> </td> </tr> <tr> <td> <input type="submit" name="num[]" value="1" /> </td> <td> <input type="submit" name="num[]" value="2" /> </td> <td> <input type="submit" name="num[]" value="3" /> </td> <td> <input type="submit" name="op" value="-" /> </td> </tr> <tr> <td> <input type="submit" name="num[]" value="0" /> </td> <td> <input type="submit" name="num[]" value="." /> </td> <td> <input type="submit" name="resultado" value="=" /> </td> <td> <input type="submit" name="op" value="+" /> </td> </tr> </table> </form> </body> </html>