<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action="cal.php" method="POST">
<input type="text" name="num1">
<select name="symbol">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" name="num2">
<input type="submit" name="submit" value="计算">
</form>
</body>
</html>
<?php
require 'cal.class.php';
if (isset($_POST['submit'])) {
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
$symbol = $_POST['symbol'];
$cal = new cal($num1, $num2, $symbol);
$cal->cal();
}
