PHP: Calculadora básica en PHP

Calculadora básica (y poco optimizada) en PHP. Corrige un fallo del original pero sigue siendo demasiado repetitiva.

Lenguaje: PHP (compilador: PHP 4)

Categoría: Básico

// Fuente procedente de ErrorDeSintaxis.es

// Calculadora básica (y poco optimizada) en

//  PHP. Corrige un fallo del original pero

//  sigue siendo demasiado repetitiva.

// Compilador: PHP 4

// Nivel: Básico

// Disponible desde 06/08/2011

// Aportado por Nacho

// Web original: http://scripts.ringsworld.com/calculators/calculator/calculator.php.html

<?php 
function square( $number ) 
{ 
$newNumber = $number * $number; 
return  
$newNumber; 
} 
function cube( $number ) 
{ 
$newNumber = $number * $number * $number; 
return  
$newNumber; 
} 
?> 
<html> 
<head> 
<title>Calculator</title> 
</head> 
 
<body> 
<div align="center"> 
  <center> 
<form method="POST" action="calculator.php"> 
<p>To perform calculations such as squares,  square roots,  <br>and  
cubes you need only fill in the first number field!<br><br> 
</p> 
<table border="0" cellspacing="1" width="304" id="calculator" height="139"> 
  <tr> 
    <td width="292" align="center" height="39"> 
    <h3>Calculator</h3> 
    </td> 
  </tr> 
  <tr> 
    <td width="292" align="center" height="23"> 
    <input type="text" name="this" size="10"><br>    <input type="text" name="that" size="10"></td> 
  </tr> 
  <tr> 
    <td width="292" align="center" height="24"> 
    <input type="submit" value="+" name="do"> 
    <input type="submit" value="-" name="do"> 
    <input type="submit" value="*" name="do"> 
    <input type="submit" value="/" name="do"><br> 
    <input type="submit" value="^2" name="do"> 
    <input type="submit" value="^3" name="do"> 
    <input type="submit" value="SqRt" name="do"> 
    </td> 
  </tr> 
<?php 
$do=$_POST['do'];
if ($do == "+"){ 
    if (($_POST['this'] != "") && ($_POST['that'] != "")) { 
    $result = $_POST['this'] + $_POST['that']; 
    } 
    else { 
    $message = "<font color="red">You did not fill in both fields!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "-"){ 
    if (($_POST['this'] != "") && ($_POST['that'] != "")) { 
    $result = $_POST['this'] - $_POST['that']; 
    } 
    else { 
    $message = "<font color="red">You did not fill in both fields!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "*"){ 
    if (($_POST['this'] != "") && ($_POST['that'] != "")) { 
    $result = $_POST['this'] * $_POST['that']; 
    } 
    else { 
    $message = "<font color="red">You did not fill in both fields!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "/"){ 
    if (($_POST['this'] != "") && ($_POST['that'] != "")) { 
    $result = $_POST['this'] / $_POST['that']; 
    } 
    else { 
    $message = "<font color="red">You did not fill in both fields!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "^2"){ 
    if ($_POST['this'] != "") { 
    $result = square ( $_POST['this'] ); 
    $that = ""; 
    } 
    else { 
    $message = "<font color="red">You did not fill in the first field!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "SqRt"){ 
    if ($_POST['this'] != "") { 
    $result = sqrt($_POST['this']); 
    $that = ""; 
    } 
    else { 
    $message = "<font color="red">You did not fill in the first field!</font>"; 
    $result = "N/A"; 
    } 
} 
elseif ($do == "^3"){ 
    if ($_POST['this'] != "") { 
    $result = cube ( $_POST['this'] ); 
    $that = ""; 
    } 
    else { 
    $message = "<font color="red">You did not fill in the first field!</font>"; 
    $result = "N/A"; 
    } 
} 
?> 
 
  <tr> 
    <td width="292" align="center" height="19"><br><b>Result: <?php echo($result); ?><br><?php echo($message); ?></b></td> 
  </tr> 
</table> 
</form> 
  </center> 
</div> 
</body> 
 
</html>

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PHP: Calculadora básica en PHP

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