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funktion.php
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funktion.php
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<?php
$erg_n = '';
$erg_z = '';
$z1 = '';
$z2 = '';
$n1 = '';
$n2 = '';
$z = '';
if (isset($_POST['z'])){
$z1 = $_POST['z1'];
$n1 = $_POST['n1'];
$z2 = $_POST['z2'];
$n2 = $_POST['n2'];
$z = $_POST['z'];
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<?php
function ggt($x1,$x2) {
do {
$rest = $x1%$x2;
$x1 = $x2;
$x2 = $rest;
} while($rest>0);
return $x1;
}
if(!empty($z)) {
switch($z)
{
case 1 : // "+"
$erg_n = $n1 * $n2;
$erg_z = ($z1*$n2) + ($z2*$n1);
break;
case 2 : // "-"
$erg_n = $n1 * $n2;
$erg_z = ($z1*$n2) - ($z2*$n1);
break;
case 3 : // "*"
$erg_n = $n1*$n2;
$erg_z = $z1*$z2;
break;
case 4 : // "/"
if($n1 != 0 && $n2!=0) {
$erg_n = $n1*$z2;
$erg_z = $z1*$n2;
}
else {
echo "Fehler: Division durch Null!";
}
break;
}
$erg_ggt = ggt($erg_z, $erg_n);
if($erg_ggt > 1) {
$erg_n = $erg_n/$erg_ggt;
$erg_z = $erg_z/$erg_ggt;
}
}
?>
<HTML>
<HEAD>
<title>Größter gemeinsamer Teiler</title>
</head>
<BODY>
<h1>Bruchrechnung</h1>
<form method="post" action="funktion.php">
<table>
<colgroup width="50" align="center" span="5"> </colgroup>
<tr>
<td align="center"> Bruch 1 </td>
<td></td>
<td align="center"> Bruch 2</td>
<td></td>
<td align="center"> Ergebnis</td>
</tr>
<tr>
<td><input type="text" name="z1" value="<?php echo $z1; ?>" /></td>
<td></td>
<td><input type="text" name="z2" value="<?php echo $z2; ?>" /></td>
<td></td>
<td><input type="text" name="erg_z" value="<?php echo $erg_z; ?>" /></td>
</tr>
<tr>
<td align="center">--------------</td>
<td align="center"> ? </td>
<td align="center">--------------</td>
<td align="center"> = </td>
<td align="center">--------------</td>
</tr>
<tr>
<td><input type="text" name="n1" value="<?php echo $n1; ?>" /></td>
<td></td>
<td><input type="text" name="n2" value="<?php echo $n2; ?>" /></td>
<td></td>
<td><input type="text" name="erg_n" value="<?php echo $erg_n; ?>" /></td>
</tr>
</table>
<table>
<colgroup width="100" align="center" span="4"></colgroup>
<tr>
<td align="center"> + <input type="radio" name="z" value="1" <?php if($z == '1') echo 'checked'; ?> /></td>
<td align="center"> - <input type="radio" name="z" value="2" <?php if($z == '2') echo 'checked'; ?> /></td>
<td align="center"> * <input type="radio" name="z" value="3" <?php if($z == '3') echo 'checked'; ?> /></td>
<td align="center"> / <input type="radio" name="z" value="4" <?php if($z == '4') echo 'checked'; ?> /></td>
</tr>
</table>
<input type="submit" name="submitted" value=" berechnen " align="center">
</form>
<?php
?>
</body>
</html>