PHP Example
Screen shot
Arithmatic Calculation Example
<?php
if(isset($_POST[\'num1\'])){
    $num1=$_POST[\'num1\'];
}

if(isset($_POST[\'num2\'])){
    $num2=$_POST[\'num2\'];
}


if(isset($_POST[\'add\'])){
    $result=$num1+$num2;
}
else if(isset($_POST[\'sub\'])){
    $result=$num1-$num2;
}
else if(isset($_POST[\'div\'])){
    $result=$num1/$num2;
}
else if(isset($_POST[\'mul\'])){
    $result=$num1*$num2;
}
?>
<html>
<head>
<title>Php Example</title>
</head>
<body>
<form name=\"frm\" action=\"\" method=\"post\">
<table border=\"1\" align=\"center\">
<tr>
<td align=\"center\" colspan=\"2\">Arithmetic calculation</td>
</tr>
<tr>
<td>Enter first number</td>
<td><input type=\"text\" name=\"num1\" value=\"<?php if(isset($num1))echo $num1;?>\"/></td>
</tr>
<tr>
<td>Enter second number</td>
<td><input type=\"text\" name=\"num2\" value=\"<?php if(isset($num2))echo $num2;?>\"/></td>
</tr>
<tr>
<td align=\"center\" colspan=\"4\">&nbsp;</td>
</tr>
<tr>
<td><?php if(isset($result))echo $result; else echo \"Result Here\";?></td>
<td>
<input type=\"submit\" name=\"add\" value=\"+\" />
<input type=\"submit\" name=\"sub\" value=\"-\" />
<input type=\"submit\" name=\"div\" value=\"/\" />
<input type=\"submit\" name=\"mul\" value=\"*\" />
</td>
</tr>
</table>
</form>
</body>
</html>

You can download source code here