<?php
$ft=$_POST['ft'];$st=$_POST['st'];$fp=$_POST['fp'];$sp=$_POST['sp'];
$ask=array($ft, $st, $fp, $sp);
for($i=0; $i<=count($ask);){
if($ask[$i]=="x"){
switch ($i){
case "0":
$answ=$st*$fp/$sp;
break;
case "1":
$answ=$ft*$sp/$fp;
break;
case "2":
$answ=$ft/$st*$sp;
break;
case "3":
$answ=$st*$fp/$ft;
break;
default:
$answ="solution is impossible";
break;
}
}
$i++;
}
?>
<html>
<body bgcolor="#234448" marginwidth="0" marginheight="0" topmargin="0" bottommargin=0>
<table height="100%" cellspacing="3" align="center" cellspacing="0" width="80%" bgcolor="#ddffff">
<tr>
<td width="100%">
</td>
</tr>
<tr>
<td style="padding:20px;" height="100%" align="left" valign="top">
<form method="post">
<table cellpadding="5" cellspacing="5" border=1 width=150 align="center" rules="cols">
<tr>
<td align="center"><input type="text" size="4" name="ft" value="x" onclick="javascript: this.value='';"></td>
<td align="center"><input type="text" size="4" name="fp" value="x" onclick="javascript: this.value='';">%</td>
</tr>
<tr>
<td align="center"><input type="text" size="4" name="st" value="x" onclick="javascript: this.value='';"></td>
<td align="center"><input type="text" size="4" name="sp" value="x" onclick="javascript: this.value='';">%</td>
</tr>
</table>
<table border="1" cellpadding="7" cellspacing="5" width=90 align="center" rules="all" style="border-top:hidden;">
<tr><td align="center"><input type="submit" value="Submit"></td></tr>
</table>
</form>
<table border="1" cellpadding="7" cellspacing="5" width=250 height=100 align="center" rules="all" >
<tr><td align="center"><?=$answ;?></td></tr>
</table>
</td>
</tr>
</table>
</body>
</html>
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