case '-':
return $a - $b;
break;
case '*':
return $a * $b;
break;
case '/':
if ($b == 0) {
echo ' На ноль делить нельзя';
} else {
return $a / $b;
}
break;
default:
echo "Что-то вы не то ввели. Попробуйте заново.";
break;
}
}
if (isset($_POST['a']) && isset($_POST['b'])) {
include 'calc_form.php';
$a = $_POST['a'];
$b = $_POST['b'];
$c = $_POST['oper'];
echo math_operations($a, $b, $c);
} else {
include 'calc_form.php';
}
?>
</body>
</html>
<meta charset="UTF-8">
<title>Калькулятор</title>
</head>
<body>
<form action="index.php" method="post" autocomplete = "on">
<fieldset>
<legend>Калькулятор</legend>
<input type="text" name="a" value="<?php
echo "{$a}";
?>
">
<input type="text" name="b" value="<?php
echo "{$b}";
?>
">
=
<?php
echo '<b>' . math_operations($a, $b, $c) . '</b>';
?>
<br>
<button name="oper" value="+" class="btn btn-success">+</button>
<button name="oper" value="-" class="btn btn-info">-</button>
<button name="oper" value="*" class="btn btn-warning">*</button>
<button name="oper" value="/" class="btn btn-danger">/</button>
</fieldset>
</form>
</body>
</html>