if(isset($_POST['yech'])){

$a = $_POST['son1'];

$b = $_POST['son2'];

$type = $_POST['type'];

if ($type == 'plus') {

$c = $a + $b;

}elseif ($type == 'minus') {

$c = $a - $b;

} elseif ($type == 'multi') {

$c = $a * $b;

}elseif ($type == 'drop'){

$c = $a / $b;

}

echo'<h2>Natija: '.$c.'</h2>';

}





echo'<form name="form" action="" method="POST">

Birinchi sonni kiriting:<br>

<input type="number" name="son1" required><br>

Amal turi:<br>

<select name="type">

<option value="plus"> Qo\'shish</option>

<option value="minus"> Ayirish</option>

<option value="multi"> Ko\'paytirish</option>

<option value="drop"> Bo\'lish</option>

</select><br>

Ikkinchi sonni kiriting:<br>

<input type="number" name="son2" required><br>

<input name="yech" type="submit" value="Yechimni ko\'rish">

</form>';