html>
head>
/head>
body>
?php
if (!empty($_POST)) {
$data1 = $_POST["data1"];
$data2 = $_POST["data2"];
$fuhao = $_POST["fuhao"];
$result = "";
echo $data1;
echo $data2;
echo $fuhao;
echo $result;
if ($fuhao == '+') {
$result = $data1 + $data2;
} else if ($fuhao == '-') {
$result = $data1 - $data2;
} else if ($fuhao == '*') {
$result = $data1 * $data2;
} else if ($fuhao == '/') {
$result = $data1 / $data2;
}
} else {
$data1 = "";
$data2 = "";
$fuhao = "";
$result = "";
}
?>
form action="caculator.php" method="post">
input type="text" name="data1" value="?php echo $data1; ?>"/>
select name="fuhao">
option value="+"
?php if ($fuhao == "+") {
echo 'selected="selected"';
} ?>>+
/option>
option value="-"
?php if ($fuhao == "-") {
echo 'selected="selected"';
} ?>>-
/option>
option value="*"
?php if ($fuhao == "*") {
echo 'selected="selected"';
} ?>>*
/option>
option value="/"
?php if ($fuhao == "/") {
echo 'selected="selected"';
} ?>>/
/option>
/option>
/select>
input type="text" name="data2" value="?php echo $data2; ?>"/>
input type="submit" value="="/>
input name="result" type="text" value="?php echo $result; ?>"/>
input type="reset"/>
/form>
/body>
/html>
