calc1111-3.html

<!DOCTYPE html>
  <html lang="ja">
    <head>
      <meta charset="UTF-8">
      <title>電卓</title> 
      <link rel="stylesheet" href="sample.css" type="text/css">
    </head>
    <body>
      <form="calc1111-3.php" method="post">
      <p class="sample">
        <input type= "text" name="left" size=3>
      
        <select name="symbol" size=1>
          <option value="">選択してください</option>
          <option value="＋">＋</option>
          <option value="－">－</option>
          <option value="×">×</option>
          <option value="÷">÷</option>
        </select>
       
        <input type="text" name="right" size=3> =?
        <br>
        <input type="submit" value="計算">
        <input type="reset" value="クリア">
        
      </form>
      <p>計算結果：
      <?php
      echo ($left.'    '.$_POST['symbol'].'    '.$right.'    '.'='.'    '.$answer); ?></p>
      </p>
    </body>
</html>