<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Số nguyên tố</title>
</head>
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL ^ E_NOTICE);
?>
<body>
<?php
function kt_snt($so)
{
$kq=1;
for($i=2;$i<=sqrt($so);$i++)
{
if($so%$i==0&&$so>2)
{
$kq=0;
break;
}
}
return $kq;
}
if(isset($_POST["n"]))
{
$n=$_POST["n"];
if($n<2) $kq='Không có SNT';
else
{
$kq="2 ";
for($i=3;$i<$n;$i++)
{
if(kt_snt($i)==1)
$kq=$kq.$i . " ";
}
$kq=$kq. " là các SNT";
}
}
;?>
<form id="form1" name="form1" method="post" action="">
<table width="300" border="0" align="center" cellpadding="1" cellspacing="1">
<tr>
<td colspan="2" align="center" bgcolor="#6633FF"><strong>TÌM SỐ NGUYÊN TỐ</strong></td>
</tr>
<tr>
<td bgcolor="#6699FF">Nhập N</td>
<td bgcolor="#6699FF"><label for="n"></label>
<input name="n" type="text" id="n" value="<?php echo $n;?>" /></td>
</tr>
<tr>
<td colspan="2" align="center" bgcolor="#6699FF"><input type="submit" name="button" id="button" value="Các số nguyên tố <= N" /></td>
</tr>
<tr>
<td colspan="2" align="center" bgcolor="#6699FF"><label for="kq"></label>
<input name="kq" type="text" disabled="disabled" id="kq" value="<?php echo $kq;?>" /></td>
</tr>
</table>
</form>
</body>
</html>
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