<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Page Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link type="text/css" href="main.css" rel="stylesheet" media="screen">
<script src="main.js"></script>
</head>
<body>
<?php
$n1 = "";
$n2 = "";
$caculate = "";
if(isset($_POST["numberi"]) && isset($_POST["numberii"]) && isset($_POST["caculate"]))
{ $n1 = $_POST["numberi"];
$n2 = $_POST["numberii"];
$caculate = $_POST["caculate"];
$flag = true;
}
if( is_numeric($n1) && is_numeric($n2) ) {
switch ($caculate) {
case "+": $result = $n1 + $n2;
break;
case "*": $result = $n1 * $n2;
break;
case "/": $result = $n1 / $n2;
break;
case "-": $result = $n1 - $n2;
break;
case "%": $result = $n1 % $n2;
break;
default: $result = $n1 + $n2;
}
}
else {
$result = "Không thực hiện được";
$flag = false;
}
?>
<div class="content">
<h1> Caculator </h1>
<form action="#" method="post" name="main-form">
<div class="row">
<span> NUMBER I </span>
<input type="text" name="numberi" value=<?php echo $n1 ?> />
</div>
<div class="row">
<span> MATH </span>
<input type="text" name="caculate" value=<?php echo $caculate ?> />
</div>
<div class="row">
<span> NUMBER II </span>
<input type="text" name="numberii" value=<?php echo $n2 ?> />
</div>
<div class="row">
<input type="submit" name="submit" value="KQ" />
</div>
<div class="row" align="center">
<?php if($flag==true){
echo "Kết quả " . $n1 . " " . $caculate . " " . $n2 . " " . "= " . $result;
}
else {
echo $result;
}
?>
</div>
</form>
</div>
</body>
</html>