<body>
<form action="" method="post">
<input type="text" name="n1" />
<input type="text" name="n2" />
<input type="submit" name="go" value="calculate" />
</form>
</body>
<?php
if(isset($_POST['go'])){
$num1=$_POST['n1'] ;
$num2=$_POST['n2'] ;
for($i=1; $i<=$num2; $i++){
$num1++;
}
echo $num1;
}
?>
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