/*Hello friend I am nmuliya1111. And I am create Addition two value in php language.*/
<?php
error_reporting(0);
if(isset($_POST["Addition"])){
$a=$_POST["txt1"];
$b=$_POST["txt2"];
$c=$a+$b;
}
?>
<!DOCTYPE html>
<html
<head>
<title>Addition operation</title>
</head>
<body>
<form action="" method="post">
<table border="1" align="center">
<tr>
<td colspan="2" align="center">Addition</td>
</tr>
<tr>
<td>Number A </td>
<td><input type="txt" name="txt1" placeholder="Enter A" required value="<?php echo $a ?>"></td>
</tr>
<tr>
<td>Number B </td>
<td><input type="txt" name="txt2" placeholder="Enter B" required value="<?php echo $b ?>"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" name="Addition" value="Addition"></td>
</tr>
<tr>
<td>Answer is </td>
<td><input type="txt" name="txt3" placeholder="Answer" value="<?php echo $c ?>"></td>
</tr>
</table>
</form>
</body>
</html>