<title>计算器</title>
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8"/>
<html>
<body>
<?php
$b = '<hr><form method="post" action = " ";
<center>数1<input type="text" name="nickname" /><br />数2<input type="text" name="abc" /></center><center><input type="radio" name="aa" value="aa" />*<input type="radio" name="bb" value="加" />+</center><center><input type="submit" name="submit" value="点击计算" />
</center>
</form>';
echo $b;
$bool = $_POST["abc"];
$book = $_POST["nickname"];
if($_POST["bb"]&&$_POST["submit"])
{
$n = $book+$bool;
echo "计算：".$n;
echo<br />;
echo $b;
}
if($_POST["aa"]&&$_POST["submit"])
{
$c = $book*$bool;
echo "结果为" .$c; echo<br />; echo $b;
echo <br />;
echo $b;
}
?>
</body>
</html>
我想弄，如：选项*，输出结果变为在输入框的上面，但是不知道那里错误，求指导
进去！