学习笔记第三天努力加油杨信陵 A00301 - 黑马程序员技术交流社区

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<!DOCTYPE html>

<html>

<head>

<meta charset=utf-8>

<!-- <meta name=description content=""> -->

<!-- <meta name=viewport content="width=device-width, initial-scale=1"> -->

    <title>计算器页面</title>

</head>

<body>

<form action="" method="POST" accept-charset="utf-8">

<input type="text" name="num1",id="">   

<select name="operator" id="">

        <option value="+">+</option>

        <option value="-">-</option>

        <option value="*">*</option>

        <option value="">/</option>

    </select>

<input type="text" name="num2" id="">&  

<input type="submit" value="计算">

<?php

if(empty($_POST)){

    die;}

$num1=$_POST['num1'];

$num2=$_POST['num2'];

$op=$_POST['operator'];

var_dump($num1,$num2,$op);

if(empty($num1)||empty($num2)){

    die("参数非法");

}

// 处理计算问题

$res="";

if($op =='+')

    $res=$num1+$num2;

elseif($op =='-')

    $res=$num1-$num2;

elseif ($op =='/')

    $res=$num1/$num2;

else

    $res=$num1*$num2;

echo "结果为:",$res;

 ?>

}

</body>

</html>