$num1 = $_POST['num1'];
$num2 =$_REQUEST['num2'];
$run = $_REQUEST['run'];
switch($run)
{
case '+':print("两数之和为：".($num1+$num2));break;
case '-':print("两数之差为：".($num1-$num2));break;
case '*':print("两数之乘积为：".($num1*$num2));break;
case '/':print("两数之和为：".($num1/$num2));break;
}
?>
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