作一个加法器，计算它们的和
2. 作一个减法器，计算它们的差
3. 作一个乘法器，计算它们的积
4. 作一个除法器，计算它们的商（和余数）
这个计算器有着俩个页面，一个页面用于输出结果
mycal.php
<html>
<head>
<title>我的计算器</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
</head>
<body>
<form action="result.php" method="post"/>
<table width="300px" border="0">
<tr><td>第一个数</td><td><input type="text" name="num1" /></td></tr>
<tr><td>第二个数</td><td><input type="text" name="num2" /></td></tr>
<tr><td>运算符</td><td>
<select name="oper">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select></td></tr>
<tr>
<td colspan="2"><input type="submit" value="计算结果"></td>
</tr>
</table>
</form>
</body>
</html>result.php
<?php
//总结一句话：
//我们按照正常的思路，应当保证接收数据的时候，$_REQUEST
//['参数']要和提交数据的页面给出html元素名字一致，如果不一致，
//则会出现notice提示，同时我们接收的数据就是null等价""
/*
if($num1==null){
echo'也没有收到值';
}
if($num1==""){
echo'也没有值';
}
echo $num1;
*/
//接收用户从mycal.php(对应静态页面 浏览器提交的数据
//1.接收num1
//$_REQUEST 该方法可以接收用户的post 或者get 请求数据
$num1=$_REQUEST['num1'];
//2.接收num2
$num2=$_REQUEST['num2'];
//3.接收运算符
$oper=$_REQUEST['oper'];
$res=0;
switch($oper){
case "+":
$res=$num1+$num2;
break;
case "-":
$res=$num1-$num2;
break;
case "*":
$res=$num1*$num2;
break;
case "/":
$res=$num1/$num2;
break;
default:
echo '运算结果不正常';
}
echo'接收到.'.$num1."||".$num2."||".$oper."<br/>";
echo '结果='.$res ;
?>
<br/>
<a href="mycal.php">返回计算器页面</a>
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