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<!DOCTYPE html>
<html>
<head>
<meta charest="UTF-8"
<title>my first thing</title>
</head>
<body>
<form>
    <input type="text" name="NUM1" placeholder="NUMBER1">
    <input type="text" name="NUM2" placeholder="NUMBER2">
    <select name="operator">
        <option>NON</option>
        <option>ADD</option>
        <option>subtract</option>
        <option>multiply</option>
        <option>divide</option>
    </select>
    <br>
    <button type="submit" name="submit" value="submit">calculate</button>
</form>
<p>the answer is:</p>
<?php
if (isset($GET_['submit'])){
    $result1=$GET_['NUMB1'];
    $result2=$GET_['NUMB2'];
    $operator=$GET_['operator'];
    switch ($operator) {
        case NON:
            echo "EROOR";
             break;
              case ADD:
            echo $result1 + $result2 ;
            break;
              case subtract:
            echo $result1 - $result2 ;
            break;
              case multiply:
           echo $result1 * $result2 ;
            break;
              case divide:
            echo $result1 / $result2 ;
            break;
    }
}
?>
</body>
</html>
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