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<html>
<head>
<title>Calculation Form</title>
</head>
<body>
<form action = "calc.php" method = "post">
Value 1: <input type = "text" name = "val1" size = "10">
Value 2: <input type = "text" name = "val2" size = "10">
<br>
Calculation: <br>
<input type = "radio" name = "calc" value = "add"> Add
<input type = "radio" name = "calc" value = "sub"> Subtract
<input type = "radio" name = "calc" value = "mul"> Multiply
<input type = "radio" name = "calc" value = "div"> Divide
<hr>
<input type = "submit" value = "Calculate">
<input type = "reset" value = "Clear">
</form>
</body>
</html>
File: calc.php
<html>
<head>
<title>Calculation Result</title>
</head>
<body>
<?php
$val1 = $_POST['val1'];
$val2 = $_POST['val2'];
$calc = $_POST['calc'];
if( is_numeric( $val1 ) && is_numeric( $val2 ) )
{
if( $calc != null )
{
switch( $calc )
{
case "add" : $result = $val1 + $val2; break;
case "sub" : $result = $val1 - $val2; break;
case "mul" : $result = $val1 * $val2; break;
case "div" : $result = $val1 / $val2; break;
}
echo( "Calculation result: $result" );
}
}
else
{
echo( "Invalid entry - please retry" );
}
?>
</body>
</html>
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