html>
head>
title>进制转换器/title>
?php
$n1=$n2="";
if($_POST){
  $n1=$_POST['n1'];
  $trans=$_POST['trans'];
  if($trans=='1'){
    $n2=decbin((int)$n1);
  }elseif($trans=='2'){
    $n2=decoct((int)$n1);
  }elseif($trans=='3'){
    $n2=dechex((int)$n1);
  }elseif($trans=='4'){
    $n2=bindec($n1);
  }elseif($trans=='5'){
    $n2=octdec($n1);
  }elseif($trans=='6'){
    $n2=hexdec($n1);
  }
}
?>
/head>
body>
form method="post" action="?act=do">
input type="text" name="n1" value="?php echo $n1;?>">
select name="trans">
option value="1">10to2/option>
option value="2">10to8/option>
option value="3">10to16/option>
option value="4">2to10/option>
option value="5">8to10/option>
option value="6">16to10/option>
/select>
input type="submit" value="转换">input type="text" name="n2" value="?php echo $n2;?>">
/form>
/body>
/html>