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- <?php session_start(); ?>
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta http-equiv="X-UA-Compatible" content="IE=edge">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <link rel="stylesheet" href="style.css">
- <title>Calculator</title>
- </head>
- <body>
- <div>
- <form action="result.php">
- <table>
- <tbody>
- <tr>
- <td><label for="n1">Number 1:</label></td>
- <td><input type="number" id="n1" name="n1"></td>
- </tr>
- <tr>
- <td><label for="n2">Number 2:</label></td>
- <td><input type="number" id="n2" name="n2"></td>
- </tr>
- <tr>
- <td><label for="op" id="op">Select operation:</label></td>
- <td>
- <select name="op" id="op">
- <option value="" selected></option>
- <option value="add">+</option>
- <option value="sub">-</option>
- <option value="mul">*</option>
- <option value="div">/</option>
- </select>
- </td>
- </tr>
- <tr>
- <td colspan="2"><input id="r" type="submit" value="Press to see your result!"></td>
- </tr>
- <?php
- if(isset($_SESSION["error"])) {
- echo '<tr class="error">
- <td colspan="2">' . $_SESSION["error"] . '</td>
- </tr>';
- }
- unset($_SESSION["error"]);
- if (isset($_SESSION["result"])) {
- echo '<tr class="result">
- <td colspan="2">' . $_SESSION["result"] . '</td>
- </tr>';
- }
- unset($_SESSION["result"])
- ?>
- </tbody>
- </table>
- </form>
- </div>
- </body>
- </html>
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