<!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>无标题文档</title>
</head>
<body>
<?php
if(!empty($_POST)){
$num1=$_POST['data1'];
$num2=$_POST['data2'];
$fuhao=$_POST['yunsuanfu'];
if($fuhao == '+'){
$jieguo = $num1+$num2;
}
else if ($fuhao =
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<?php
if(!empty($_POST)){
$num1=$_POST['data1'];
$num2=$_POST['data2'];
$fuhao=$_POST['yunsuanfu'];
if($fuhao == '+'){
$jieguo = $num1+$num2;
}
else if ($fuhao =