<!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">
<title>Php calculator</title>
</head>
<?php
$result = '';
if(isset($_POST['operator'])){
$fnumber = $_POST['first_num'];
$snumber = $_POST['second_num'];
$op_value = $_POST['Btn'];
switch($op_value){
case 'Add';
$result = $fnumber + $snumber;
break;
case 'Subtract';
$result = $fnumber - $snumber;
break;
case 'Multiply';
$result = $fnumber * $snumber;
break;
case 'Divide';
$result = $fnumber / $snumber;
break;
default:
$result = 'Null';
break
}
}
?>
<body>
<div id="page-wrap">
<h1>PHP - Simple Calculator Program</h1>
<form action="" method="post" id="quiz-form">
<p>
<input type="number" name="fnumber" id="fnumber" required="required" value="<?php echo $fnumber; ?>" /> <b>First Number</b>
</p>
<p>
<input type="number" name="snumber" id="snumber" required="required" value="<?php echo $snumber; ?>" /> <b>Second Number</b>
</p>
<p>
<input readonly="readonly" name="result" value="<?php echo $result; ?>"> <b>Result</b>
</p>
<input type="submit" name="Btn" value="Add" />
<input type="submit" name="Btn" value="Subtract" />
<input type="submit" name="Btn" value="Multiply" />
<input type="submit" name="Btn" value="Divide" />
</form>
</div>
</body>
</html>
Thanks you for commenting your questions. I will see question and respond you.