Source code
<html>
<head>
<meta name="viewport" content="device=width-device, initial-scale=1">
<title>
Konversi Satuan Panjang
</title>
</head>
<body>
<?php
if($_GET['i']==1){
$bil1='';
$bil2='';
$bil3='';
$bil4='';
$bil5='';
}
else
{$bil1=$_POST['bil1'];
$bil2=$_POST['bil2'];
$bil3=$_POST['bil3'];
$bil4=$_POST['volume'];
$nama=$_POST['nama'];
$nama2=$_POST['nama2'];
}
?>
<form method='POST'>
<h1>Konversi Satuan Panjang</h1>
<table>
<tr><td>Satuan Awal:<td></tr>
<tr><td>
<select name='nama'>
<option><?php echo $nama; ?></option>
<option>km</option>
<option>hm</option>
<option>dam</option>
<option>m</option>
<option>dm</option>
<option>cm</option>
<option>mm</option>
</select>
</td></tr>
<tr><td>Masukan nilai</td><td><input type=text name='bil1' value='<?php echo $bil1; ?>' ></td></tr>
<tr><td>Konversi ke:<td></tr>
<tr><td>
<select name='nama2'>
<option><?php echo $nama2; ?></option>
<option>km</option>
<option>hm</option>
<option>dam</option>
<option>m</option>
<option>dm</option>
<option>cm</option>
<option>mm</option>
</select>
</td></tr>
<tr><td colspan=2>
<input type='submit' name='volume' value='konversi'>
<a href='index.php?$i=1'><input type='button' name='rusuk' value='reset'></a>
</td></tr><tr><td>
</table>
</form>
<?php
$nama=$_POST['nama'];
$nama2=$_POST['nama2'];
$bil2=$_POST['bil2'];
$bil3=$_POST['bil3'];
$bil4=$_POST['vol'];
$bil5=$_POST['bil5'];
//volume
$sat=array('km'=>1,'hm'=>2,'dam'=>3,'m'=>4,'dm'=>5,'cm'=>6,'mm'=>7);
if(isset($_POST['volume']))
{
$a=$sat[$nama];
$b=$sat[$nama2];
$c=$a*$b;
if($sa<=$b)
{
$c=$b-$a;
$bil2=$bil1*(10**$c);
echo "<h4>$bil1 $nama = $bil2 $nama2</h4>";
}
else
{
$c=$a-$b;
$bil2=$bil1/(10**$c);
echo "<h4>$bil1 $nama = $bil2 $nama2</h4>";
}
}
?><iframe width="350" height="315" src="https://www.youtube.com/embed/vrv1GIcOvzY?autoplay=1&mute=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</body>
</html>
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